JAVASCRIPT 47
Prototype.js Guest on 6th August 2020 05:01:53 PM
  1. /*  Prototype JavaScript framework, version 1.6.0.2
  2.  *  (c) 2005-2008 Sam Stephenson
  3.  *
  4.  *  Prototype is freely distributable under the terms of an MIT-style license.
  5.  *  For details, see the Prototype web site: http://www.prototypejs.org/
  6.  *
  7.  *--------------------------------------------------------------------------*/
  8.  
  9. var Prototype = {
  10.   Version: '1.6.0.2',
  11.  
  12.   Browser: {
  13.     IE:     !!(window.attachEvent && !window.opera),
  14.     Opera:  !!window.opera,
  15.     WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
  16.     Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
  17.     MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  18.   },
  19.  
  20.   BrowserFeatures: {
  21.     XPath: !!document.evaluate,
  22.     ElementExtensions: !!window.HTMLElement,
  23.     SpecificElementExtensions:
  24.       document.createElement('div').__proto__ &&
  25.       document.createElement('div').__proto__ !==
  26.         document.createElement('form').__proto__
  27.   },
  28.  
  29.   ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  30.   JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
  31.  
  32.   emptyFunction: function() { },
  33.   K: function(x) { return x }
  34. };
  35.  
  36. if (Prototype.Browser.MobileSafari)
  37.   Prototype.BrowserFeatures.SpecificElementExtensions = false;
  38.  
  39.  
  40. /* Based on Alex Arnell's inheritance implementation. */
  41. var Class = {
  42.   create: function() {
  43.     var parent = null, properties = $A(arguments);
  44.     if (Object.isFunction(properties[0]))
  45.       parent = properties.shift();
  46.  
  47.     function klass() {
  48.       this.initialize.apply(this, arguments);
  49.     }
  50.  
  51.     Object.extend(klass, Class.Methods);
  52.     klass.superclass = parent;
  53.     klass.subclasses = [];
  54.  
  55.     if (parent) {
  56.       var subclass = function() { };
  57.       subclass.prototype = parent.prototype;
  58.       klass.prototype = new subclass;
  59.       parent.subclasses.push(klass);
  60.     }
  61.  
  62.     for (var i = 0; i < properties.length; i++)
  63.       klass.addMethods(properties[i]);
  64.  
  65.     if (!klass.prototype.initialize)
  66.       klass.prototype.initialize = Prototype.emptyFunction;
  67.  
  68.     klass.prototype.constructor = klass;
  69.  
  70.     return klass;
  71.   }
  72. };
  73.  
  74. Class.Methods = {
  75.   addMethods: function(source) {
  76.     var ancestor   = this.superclass && this.superclass.prototype;
  77.     var properties = Object.keys(source);
  78.  
  79.     if (!Object.keys({ toString: true }).length)
  80.       properties.push("toString", "valueOf");
  81.  
  82.     for (var i = 0, length = properties.length; i < length; i++) {
  83.       var property = properties[i], value = source[property];
  84.       if (ancestor && Object.isFunction(value) &&
  85.           value.argumentNames().first() == "$super") {
  86.         var method = value, value = Object.extend((function(m) {
  87.           return function() { return ancestor[m].apply(this, arguments) };
  88.         })(property).wrap(method), {
  89.           valueOf:  function() { return method },
  90.           toString: function() { return method.toString() }
  91.         });
  92.       }
  93.       this.prototype[property] = value;
  94.     }
  95.  
  96.     return this;
  97.   }
  98. };
  99.  
  100. var Abstract = { };
  101.  
  102. Object.extend = function(destination, source) {
  103.   for (var property in source)
  104.     destination[property] = source[property];
  105.   return destination;
  106. };
  107.  
  108. Object.extend(Object, {
  109.   inspect: function(object) {
  110.     try {
  111.       if (Object.isUndefined(object)) return 'undefined';
  112.       if (object === null) return 'null';
  113.       return object.inspect ? object.inspect() : String(object);
  114.     } catch (e) {
  115.       if (e instanceof RangeError) return '...';
  116.       throw e;
  117.     }
  118.   },
  119.  
  120.   toJSON: function(object) {
  121.     var type = typeof object;
  122.     switch (type) {
  123.       case 'undefined':
  124.       case 'function':
  125.       case 'unknown': return;
  126.       case 'boolean': return object.toString();
  127.     }
  128.  
  129.     if (object === null) return 'null';
  130.     if (object.toJSON) return object.toJSON();
  131.     if (Object.isElement(object)) return;
  132.  
  133.     var results = [];
  134.     for (var property in object) {
  135.       var value = Object.toJSON(object[property]);
  136.       if (!Object.isUndefined(value))
  137.         results.push(property.toJSON() + ': ' + value);
  138.     }
  139.  
  140.     return '{' + results.join(', ') + '}';
  141.   },
  142.  
  143.   toQueryString: function(object) {
  144.     return $H(object).toQueryString();
  145.   },
  146.  
  147.   toHTML: function(object) {
  148.     return object && object.toHTML ? object.toHTML() : String.interpret(object);
  149.   },
  150.  
  151.   keys: function(object) {
  152.     var keys = [];
  153.     for (var property in object)
  154.       keys.push(property);
  155.     return keys;
  156.   },
  157.  
  158.   values: function(object) {
  159.     var values = [];
  160.     for (var property in object)
  161.       values.push(object[property]);
  162.     return values;
  163.   },
  164.  
  165.   clone: function(object) {
  166.     return Object.extend({ }, object);
  167.   },
  168.  
  169.   isElement: function(object) {
  170.     return object && object.nodeType == 1;
  171.   },
  172.  
  173.   isArray: function(object) {
  174.     return object != null && typeof object == "object" &&
  175.       'splice' in object && 'join' in object;
  176.   },
  177.  
  178.   isHash: function(object) {
  179.     return object instanceof Hash;
  180.   },
  181.  
  182.   isFunction: function(object) {
  183.     return typeof object == "function";
  184.   },
  185.  
  186.   isString: function(object) {
  187.     return typeof object == "string";
  188.   },
  189.  
  190.   isNumber: function(object) {
  191.     return typeof object == "number";
  192.   },
  193.  
  194.   isUndefined: function(object) {
  195.     return typeof object == "undefined";
  196.   }
  197. });
  198.  
  199. Object.extend(Function.prototype, {
  200.   argumentNames: function() {
  201.     var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
  202.     return names.length == 1 && !names[0] ? [] : names;
  203.   },
  204.  
  205.   bind: function() {
  206.     if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
  207.     var __method = this, args = $A(arguments), object = args.shift();
  208.     return function() {
  209.       return __method.apply(object, args.concat($A(arguments)));
  210.     }
  211.   },
  212.  
  213.   bindAsEventListener: function() {
  214.     var __method = this, args = $A(arguments), object = args.shift();
  215.     return function(event) {
  216.       return __method.apply(object, [event || window.event].concat(args));
  217.     }
  218.   },
  219.  
  220.   curry: function() {
  221.     if (!arguments.length) return this;
  222.     var __method = this, args = $A(arguments);
  223.     return function() {
  224.       return __method.apply(this, args.concat($A(arguments)));
  225.     }
  226.   },
  227.  
  228.   delay: function() {
  229.     var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
  230.     return window.setTimeout(function() {
  231.       return __method.apply(__method, args);
  232.     }, timeout);
  233.   },
  234.  
  235.   wrap: function(wrapper) {
  236.     var __method = this;
  237.     return function() {
  238.       return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
  239.     }
  240.   },
  241.  
  242.   methodize: function() {
  243.     if (this._methodized) return this._methodized;
  244.     var __method = this;
  245.     return this._methodized = function() {
  246.       return __method.apply(null, [this].concat($A(arguments)));
  247.     };
  248.   }
  249. });
  250.  
  251. Function.prototype.defer = Function.prototype.delay.curry(0.01);
  252.  
  253. Date.prototype.toJSON = function() {
  254.   return '"' + this.getUTCFullYear() + '-' +
  255.     (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
  256.     this.getUTCDate().toPaddedString(2) + 'T' +
  257.     this.getUTCHours().toPaddedString(2) + ':' +
  258.     this.getUTCMinutes().toPaddedString(2) + ':' +
  259.     this.getUTCSeconds().toPaddedString(2) + 'Z"';
  260. };
  261.  
  262. var Try = {
  263.   these: function() {
  264.     var returnValue;
  265.  
  266.     for (var i = 0, length = arguments.length; i < length; i++) {
  267.       var lambda = arguments[i];
  268.       try {
  269.         returnValue = lambda();
  270.         break;
  271.       } catch (e) { }
  272.     }
  273.  
  274.     return returnValue;
  275.   }
  276. };
  277.  
  278. RegExp.prototype.match = RegExp.prototype.test;
  279.  
  280. RegExp.escape = function(str) {
  281.   return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
  282. };
  283.  
  284. /*--------------------------------------------------------------------------*/
  285.  
  286. var PeriodicalExecuter = Class.create({
  287.   initialize: function(callback, frequency) {
  288.     this.callback = callback;
  289.     this.frequency = frequency;
  290.     this.currentlyExecuting = false;
  291.  
  292.     this.registerCallback();
  293.   },
  294.  
  295.   registerCallback: function() {
  296.     this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
  297.   },
  298.  
  299.   execute: function() {
  300.     this.callback(this);
  301.   },
  302.  
  303.   stop: function() {
  304.     if (!this.timer) return;
  305.     clearInterval(this.timer);
  306.     this.timer = null;
  307.   },
  308.  
  309.   onTimerEvent: function() {
  310.     if (!this.currentlyExecuting) {
  311.       try {
  312.         this.currentlyExecuting = true;
  313.         this.execute();
  314.       } finally {
  315.         this.currentlyExecuting = false;
  316.       }
  317.     }
  318.   }
  319. });
  320. Object.extend(String, {
  321.   interpret: function(value) {
  322.     return value == null ? '' : String(value);
  323.   },
  324.   specialChar: {
  325.     '\b': '\\b',
  326.     '\t': '\\t',
  327.     '\n': '\\n',
  328.     '\f': '\\f',
  329.     '\r': '\\r',
  330.     '\\': '\\\\'
  331.   }
  332. });
  333.  
  334. Object.extend(String.prototype, {
  335.   gsub: function(pattern, replacement) {
  336.     var result = '', source = this, match;
  337.     replacement = arguments.callee.prepareReplacement(replacement);
  338.  
  339.     while (source.length > 0) {
  340.       if (match = source.match(pattern)) {
  341.         result += source.slice(0, match.index);
  342.         result += String.interpret(replacement(match));
  343.         source  = source.slice(match.index + match[0].length);
  344.       } else {
  345.         result += source, source = '';
  346.       }
  347.     }
  348.     return result;
  349.   },
  350.  
  351.   sub: function(pattern, replacement, count) {
  352.     replacement = this.gsub.prepareReplacement(replacement);
  353.     count = Object.isUndefined(count) ? 1 : count;
  354.  
  355.     return this.gsub(pattern, function(match) {
  356.       if (--count < 0) return match[0];
  357.       return replacement(match);
  358.     });
  359.   },
  360.  
  361.   scan: function(pattern, iterator) {
  362.     this.gsub(pattern, iterator);
  363.     return String(this);
  364.   },
  365.  
  366.   truncate: function(length, truncation) {
  367.     length = length || 30;
  368.     truncation = Object.isUndefined(truncation) ? '...' : truncation;
  369.     return this.length > length ?
  370.       this.slice(0, length - truncation.length) + truncation : String(this);
  371.   },
  372.  
  373.   strip: function() {
  374.     return this.replace(/^\s+/, '').replace(/\s+$/, '');
  375.   },
  376.  
  377.   stripTags: function() {
  378.     return this.replace(/<\/?[^>]+>/gi, '');
  379.   },
  380.  
  381.   stripScripts: function() {
  382.     return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
  383.   },
  384.  
  385.   extractScripts: function() {
  386.     var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
  387.     var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
  388.     return (this.match(matchAll) || []).map(function(scriptTag) {
  389.       return (scriptTag.match(matchOne) || ['', ''])[1];
  390.     });
  391.   },
  392.  
  393.   evalScripts: function() {
  394.     return this.extractScripts().map(function(script) { return eval(script) });
  395.   },
  396.  
  397.   escapeHTML: function() {
  398.     var self = arguments.callee;
  399.     self.text.data = this;
  400.     return self.div.innerHTML;
  401.   },
  402.  
  403.   unescapeHTML: function() {
  404.     var div = new Element('div');
  405.     div.innerHTML = this.stripTags();
  406.     return div.childNodes[0] ? (div.childNodes.length > 1 ?
  407.       $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
  408.       div.childNodes[0].nodeValue) : '';
  409.   },
  410.  
  411.   toQueryParams: function(separator) {
  412.     var match = this.strip().match(/([^?#]*)(#.*)?$/);
  413.     if (!match) return { };
  414.  
  415.     return match[1].split(separator || '&').inject({ }, function(hash, pair) {
  416.       if ((pair = pair.split('='))[0]) {
  417.         var key = decodeURIComponent(pair.shift());
  418.         var value = pair.length > 1 ? pair.join('=') : pair[0];
  419.         if (value != undefined) value = decodeURIComponent(value);
  420.  
  421.         if (key in hash) {
  422.           if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
  423.           hash[key].push(value);
  424.         }
  425.         else hash[key] = value;
  426.       }
  427.       return hash;
  428.     });
  429.   },
  430.  
  431.   toArray: function() {
  432.     return this.split('');
  433.   },
  434.  
  435.   succ: function() {
  436.     return this.slice(0, this.length - 1) +
  437.       String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
  438.   },
  439.  
  440.   times: function(count) {
  441.     return count < 1 ? '' : new Array(count + 1).join(this);
  442.   },
  443.  
  444.   camelize: function() {
  445.     var parts = this.split('-'), len = parts.length;
  446.     if (len == 1) return parts[0];
  447.  
  448.     var camelized = this.charAt(0) == '-'
  449.       ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
  450.       : parts[0];
  451.  
  452.     for (var i = 1; i < len; i++)
  453.       camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
  454.  
  455.     return camelized;
  456.   },
  457.  
  458.   capitalize: function() {
  459.     return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
  460.   },
  461.  
  462.   underscore: function() {
  463.     return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
  464.   },
  465.  
  466.   dasherize: function() {
  467.     return this.gsub(/_/,'-');
  468.   },
  469.  
  470.   inspect: function(useDoubleQuotes) {
  471.     var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
  472.       var character = String.specialChar[match[0]];
  473.       return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
  474.     });
  475.     if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
  476.     return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  477.   },
  478.  
  479.   toJSON: function() {
  480.     return this.inspect(true);
  481.   },
  482.  
  483.   unfilterJSON: function(filter) {
  484.     return this.sub(filter || Prototype.JSONFilter, '#{1}');
  485.   },
  486.  
  487.   isJSON: function() {
  488.     var str = this;
  489.     if (str.blank()) return false;
  490.     str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
  491.     return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
  492.   },
  493.  
  494.   evalJSON: function(sanitize) {
  495.     var json = this.unfilterJSON();
  496.     try {
  497.       if (!sanitize || json.isJSON()) return eval('(' + json + ')');
  498.     } catch (e) { }
  499.     throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
  500.   },
  501.  
  502.   include: function(pattern) {
  503.     return this.indexOf(pattern) > -1;
  504.   },
  505.  
  506.   startsWith: function(pattern) {
  507.     return this.indexOf(pattern) === 0;
  508.   },
  509.  
  510.   endsWith: function(pattern) {
  511.     var d = this.length - pattern.length;
  512.     return d >= 0 && this.lastIndexOf(pattern) === d;
  513.   },
  514.  
  515.   empty: function() {
  516.     return this == '';
  517.   },
  518.  
  519.   blank: function() {
  520.     return /^\s*$/.test(this);
  521.   },
  522.  
  523.   interpolate: function(object, pattern) {
  524.     return new Template(this, pattern).evaluate(object);
  525.   }
  526. });
  527.  
  528. if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
  529.   escapeHTML: function() {
  530.     return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
  531.   },
  532.   unescapeHTML: function() {
  533.     return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
  534.   }
  535. });
  536.  
  537. String.prototype.gsub.prepareReplacement = function(replacement) {
  538.   if (Object.isFunction(replacement)) return replacement;
  539.   var template = new Template(replacement);
  540.   return function(match) { return template.evaluate(match) };
  541. };
  542.  
  543. String.prototype.parseQuery = String.prototype.toQueryParams;
  544.  
  545. Object.extend(String.prototype.escapeHTML, {
  546.   div:  document.createElement('div'),
  547.   text: document.createTextNode('')
  548. });
  549.  
  550. with (String.prototype.escapeHTML) div.appendChild(text);
  551.  
  552. var Template = Class.create({
  553.   initialize: function(template, pattern) {
  554.     this.template = template.toString();
  555.     this.pattern = pattern || Template.Pattern;
  556.   },
  557.  
  558.   evaluate: function(object) {
  559.     if (Object.isFunction(object.toTemplateReplacements))
  560.       object = object.toTemplateReplacements();
  561.  
  562.     return this.template.gsub(this.pattern, function(match) {
  563.       if (object == null) return '';
  564.  
  565.       var before = match[1] || '';
  566.       if (before == '\\') return match[2];
  567.  
  568.       var ctx = object, expr = match[3];
  569.       var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
  570.       match = pattern.exec(expr);
  571.       if (match == null) return before;
  572.  
  573.       while (match != null) {
  574.         var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
  575.         ctx = ctx[comp];
  576.         if (null == ctx || '' == match[3]) break;
  577.         expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
  578.         match = pattern.exec(expr);
  579.       }
  580.  
  581.       return before + String.interpret(ctx);
  582.     });
  583.   }
  584. });
  585. Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
  586.  
  587. var $break = { };
  588.  
  589. var Enumerable = {
  590.   each: function(iterator, context) {
  591.     var index = 0;
  592.     iterator = iterator.bind(context);
  593.     try {
  594.       this._each(function(value) {
  595.         iterator(value, index++);
  596.       });
  597.     } catch (e) {
  598.       if (e != $break) throw e;
  599.     }
  600.     return this;
  601.   },
  602.  
  603.   eachSlice: function(number, iterator, context) {
  604.     iterator = iterator ? iterator.bind(context) : Prototype.K;
  605.     var index = -number, slices = [], array = this.toArray();
  606.     while ((index += number) < array.length)
  607.       slices.push(array.slice(index, index+number));
  608.     return slices.collect(iterator, context);
  609.   },
  610.  
  611.   all: function(iterator, context) {
  612.     iterator = iterator ? iterator.bind(context) : Prototype.K;
  613.     var result = true;
  614.     this.each(function(value, index) {
  615.       result = result && !!iterator(value, index);
  616.       if (!result) throw $break;
  617.     });
  618.     return result;
  619.   },
  620.  
  621.   any: function(iterator, context) {
  622.     iterator = iterator ? iterator.bind(context) : Prototype.K;
  623.     var result = false;
  624.     this.each(function(value, index) {
  625.       if (result = !!iterator(value, index))
  626.         throw $break;
  627.     });
  628.     return result;
  629.   },
  630.  
  631.   collect: function(iterator, context) {
  632.     iterator = iterator ? iterator.bind(context) : Prototype.K;
  633.     var results = [];
  634.     this.each(function(value, index) {
  635.       results.push(iterator(value, index));
  636.     });
  637.     return results;
  638.   },
  639.  
  640.   detect: function(iterator, context) {
  641.     iterator = iterator.bind(context);
  642.     var result;
  643.     this.each(function(value, index) {
  644.       if (iterator(value, index)) {
  645.         result = value;
  646.         throw $break;
  647.       }
  648.     });
  649.     return result;
  650.   },
  651.  
  652.   findAll: function(iterator, context) {
  653.     iterator = iterator.bind(context);
  654.     var results = [];
  655.     this.each(function(value, index) {
  656.       if (iterator(value, index))
  657.         results.push(value);
  658.     });
  659.     return results;
  660.   },
  661.  
  662.   grep: function(filter, iterator, context) {
  663.     iterator = iterator ? iterator.bind(context) : Prototype.K;
  664.     var results = [];
  665.  
  666.     if (Object.isString(filter))
  667.       filter = new RegExp(filter);
  668.  
  669.     this.each(function(value, index) {
  670.       if (filter.match(value))
  671.         results.push(iterator(value, index));
  672.     });
  673.     return results;
  674.   },
  675.  
  676.   include: function(object) {
  677.     if (Object.isFunction(this.indexOf))
  678.       if (this.indexOf(object) != -1) return true;
  679.  
  680.     var found = false;
  681.     this.each(function(value) {
  682.       if (value == object) {
  683.         found = true;
  684.         throw $break;
  685.       }
  686.     });
  687.     return found;
  688.   },
  689.  
  690.   inGroupsOf: function(number, fillWith) {
  691.     fillWith = Object.isUndefined(fillWith) ? null : fillWith;
  692.     return this.eachSlice(number, function(slice) {
  693.       while(slice.length < number) slice.push(fillWith);
  694.       return slice;
  695.     });
  696.   },
  697.  
  698.   inject: function(memo, iterator, context) {
  699.     iterator = iterator.bind(context);
  700.     this.each(function(value, index) {
  701.       memo = iterator(memo, value, index);
  702.     });
  703.     return memo;
  704.   },
  705.  
  706.   invoke: function(method) {
  707.     var args = $A(arguments).slice(1);
  708.     return this.map(function(value) {
  709.       return value[method].apply(value, args);
  710.     });
  711.   },
  712.  
  713.   max: function(iterator, context) {
  714.     iterator = iterator ? iterator.bind(context) : Prototype.K;
  715.     var result;
  716.     this.each(function(value, index) {
  717.       value = iterator(value, index);
  718.       if (result == null || value >= result)
  719.         result = value;
  720.     });
  721.     return result;
  722.   },
  723.  
  724.   min: function(iterator, context) {
  725.     iterator = iterator ? iterator.bind(context) : Prototype.K;
  726.     var result;
  727.     this.each(function(value, index) {
  728.       value = iterator(value, index);
  729.       if (result == null || value < result)
  730.         result = value;
  731.     });
  732.     return result;
  733.   },
  734.  
  735.   partition: function(iterator, context) {
  736.     iterator = iterator ? iterator.bind(context) : Prototype.K;
  737.     var trues = [], falses = [];
  738.     this.each(function(value, index) {
  739.       (iterator(value, index) ?
  740.         trues : falses).push(value);
  741.     });
  742.     return [trues, falses];
  743.   },
  744.  
  745.   pluck: function(property) {
  746.     var results = [];
  747.     this.each(function(value) {
  748.       results.push(value[property]);
  749.     });
  750.     return results;
  751.   },
  752.  
  753.   reject: function(iterator, context) {
  754.     iterator = iterator.bind(context);
  755.     var results = [];
  756.     this.each(function(value, index) {
  757.       if (!iterator(value, index))
  758.         results.push(value);
  759.     });
  760.     return results;
  761.   },
  762.  
  763.   sortBy: function(iterator, context) {
  764.     iterator = iterator.bind(context);
  765.     return this.map(function(value, index) {
  766.       return {value: value, criteria: iterator(value, index)};
  767.     }).sort(function(left, right) {
  768.       var a = left.criteria, b = right.criteria;
  769.       return a < b ? -1 : a > b ? 1 : 0;
  770.     }).pluck('value');
  771.   },
  772.  
  773.   toArray: function() {
  774.     return this.map();
  775.   },
  776.  
  777.   zip: function() {
  778.     var iterator = Prototype.K, args = $A(arguments);
  779.     if (Object.isFunction(args.last()))
  780.       iterator = args.pop();
  781.  
  782.     var collections = [this].concat(args).map($A);
  783.     return this.map(function(value, index) {
  784.       return iterator(collections.pluck(index));
  785.     });
  786.   },
  787.  
  788.   size: function() {
  789.     return this.toArray().length;
  790.   },
  791.  
  792.   inspect: function() {
  793.     return '#<Enumerable:' + this.toArray().inspect() + '>';
  794.   }
  795. };
  796.  
  797. Object.extend(Enumerable, {
  798.   map:     Enumerable.collect,
  799.   find:    Enumerable.detect,
  800.   select:  Enumerable.findAll,
  801.   filter:  Enumerable.findAll,
  802.   member:  Enumerable.include,
  803.   entries: Enumerable.toArray,
  804.   every:   Enumerable.all,
  805.   some:    Enumerable.any
  806. });
  807. function $A(iterable) {
  808.   if (!iterable) return [];
  809.   if (iterable.toArray) return iterable.toArray();
  810.   var length = iterable.length || 0, results = new Array(length);
  811.   while (length--) results[length] = iterable[length];
  812.   return results;
  813. }
  814.  
  815. if (Prototype.Browser.WebKit) {
  816.   $A = function(iterable) {
  817.     if (!iterable) return [];
  818.     if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
  819.         iterable.toArray) return iterable.toArray();
  820.     var length = iterable.length || 0, results = new Array(length);
  821.     while (length--) results[length] = iterable[length];
  822.     return results;
  823.   };
  824. }
  825.  
  826. Array.from = $A;
  827.  
  828. Object.extend(Array.prototype, Enumerable);
  829.  
  830. if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
  831.  
  832. Object.extend(Array.prototype, {
  833.   _each: function(iterator) {
  834.     for (var i = 0, length = this.length; i < length; i++)
  835.       iterator(this[i]);
  836.   },
  837.  
  838.   clear: function() {
  839.     this.length = 0;
  840.     return this;
  841.   },
  842.  
  843.   first: function() {
  844.     return this[0];
  845.   },
  846.  
  847.   last: function() {
  848.     return this[this.length - 1];
  849.   },
  850.  
  851.   compact: function() {
  852.     return this.select(function(value) {
  853.       return value != null;
  854.     });
  855.   },
  856.  
  857.   flatten: function() {
  858.     return this.inject([], function(array, value) {
  859.       return array.concat(Object.isArray(value) ?
  860.         value.flatten() : [value]);
  861.     });
  862.   },
  863.  
  864.   without: function() {
  865.     var values = $A(arguments);
  866.     return this.select(function(value) {
  867.       return !values.include(value);
  868.     });
  869.   },
  870.  
  871.   reverse: function(inline) {
  872.     return (inline !== false ? this : this.toArray())._reverse();
  873.   },
  874.  
  875.   reduce: function() {
  876.     return this.length > 1 ? this : this[0];
  877.   },
  878.  
  879.   uniq: function(sorted) {
  880.     return this.inject([], function(array, value, index) {
  881.       if (0 == index || (sorted ? array.last() != value : !array.include(value)))
  882.         array.push(value);
  883.       return array;
  884.     });
  885.   },
  886.  
  887.   intersect: function(array) {
  888.     return this.uniq().findAll(function(item) {
  889.       return array.detect(function(value) { return item === value });
  890.     });
  891.   },
  892.  
  893.   clone: function() {
  894.     return [].concat(this);
  895.   },
  896.  
  897.   size: function() {
  898.     return this.length;
  899.   },
  900.  
  901.   inspect: function() {
  902.     return '[' + this.map(Object.inspect).join(', ') + ']';
  903.   },
  904.  
  905.   toJSON: function() {
  906.     var results = [];
  907.     this.each(function(object) {
  908.       var value = Object.toJSON(object);
  909.       if (!Object.isUndefined(value)) results.push(value);
  910.     });
  911.     return '[' + results.join(', ') + ']';
  912.   }
  913. });
  914.  
  915. // use native browser JS 1.6 implementation if available
  916. if (Object.isFunction(Array.prototype.forEach))
  917.   Array.prototype._each = Array.prototype.forEach;
  918.  
  919. if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
  920.   i || (i = 0);
  921.   var length = this.length;
  922.   if (i < 0) i = length + i;
  923.   for (; i < length; i++)
  924.     if (this[i] === item) return i;
  925.   return -1;
  926. };
  927.  
  928. if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
  929.   i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
  930.   var n = this.slice(0, i).reverse().indexOf(item);
  931.   return (n < 0) ? n : i - n - 1;
  932. };
  933.  
  934. Array.prototype.toArray = Array.prototype.clone;
  935.  
  936. function $w(string) {
  937.   if (!Object.isString(string)) return [];
  938.   string = string.strip();
  939.   return string ? string.split(/\s+/) : [];
  940. }
  941.  
  942. if (Prototype.Browser.Opera){
  943.   Array.prototype.concat = function() {
  944.     var array = [];
  945.     for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
  946.     for (var i = 0, length = arguments.length; i < length; i++) {
  947.       if (Object.isArray(arguments[i])) {
  948.         for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
  949.           array.push(arguments[i][j]);
  950.       } else {
  951.         array.push(arguments[i]);
  952.       }
  953.     }
  954.     return array;
  955.   };
  956. }
  957. Object.extend(Number.prototype, {
  958.   toColorPart: function() {
  959.     return this.toPaddedString(2, 16);
  960.   },
  961.  
  962.   succ: function() {
  963.     return this + 1;
  964.   },
  965.  
  966.   times: function(iterator) {
  967.     $R(0, this, true).each(iterator);
  968.     return this;
  969.   },
  970.  
  971.   toPaddedString: function(length, radix) {
  972.     var string = this.toString(radix || 10);
  973.     return '0'.times(length - string.length) + string;
  974.   },
  975.  
  976.   toJSON: function() {
  977.     return isFinite(this) ? this.toString() : 'null';
  978.   }
  979. });
  980.  
  981. $w('abs round ceil floor').each(function(method){
  982.   Number.prototype[method] = Math[method].methodize();
  983. });
  984. function $H(object) {
  985.   return new Hash(object);
  986. };
  987.  
  988. var Hash = Class.create(Enumerable, (function() {
  989.  
  990.   function toQueryPair(key, value) {
  991.     if (Object.isUndefined(value)) return key;
  992.     return key + '=' + encodeURIComponent(String.interpret(value));
  993.   }
  994.  
  995.   return {
  996.     initialize: function(object) {
  997.       this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
  998.     },
  999.  
  1000.     _each: function(iterator) {
  1001.       for (var key in this._object) {
  1002.         var value = this._object[key], pair = [key, value];
  1003.         pair.key = key;
  1004.         pair.value = value;
  1005.         iterator(pair);
  1006.       }
  1007.     },
  1008.  
  1009.     set: function(key, value) {
  1010.       return this._object[key] = value;
  1011.     },
  1012.  
  1013.     get: function(key) {
  1014.       return this._object[key];
  1015.     },
  1016.  
  1017.     unset: function(key) {
  1018.       var value = this._object[key];
  1019.       delete this._object[key];
  1020.       return value;
  1021.     },
  1022.  
  1023.     toObject: function() {
  1024.       return Object.clone(this._object);
  1025.     },
  1026.  
  1027.     keys: function() {
  1028.       return this.pluck('key');
  1029.     },
  1030.  
  1031.     values: function() {
  1032.       return this.pluck('value');
  1033.     },
  1034.  
  1035.     index: function(value) {
  1036.       var match = this.detect(function(pair) {
  1037.         return pair.value === value;
  1038.       });
  1039.       return match && match.key;
  1040.     },
  1041.  
  1042.     merge: function(object) {
  1043.       return this.clone().update(object);
  1044.     },
  1045.  
  1046.     update: function(object) {
  1047.       return new Hash(object).inject(this, function(result, pair) {
  1048.         result.set(pair.key, pair.value);
  1049.         return result;
  1050.       });
  1051.     },
  1052.  
  1053.     toQueryString: function() {
  1054.       return this.map(function(pair) {
  1055.         var key = encodeURIComponent(pair.key), values = pair.value;
  1056.  
  1057.         if (values && typeof values == 'object') {
  1058.           if (Object.isArray(values))
  1059.             return values.map(toQueryPair.curry(key)).join('&');
  1060.         }
  1061.         return toQueryPair(key, values);
  1062.       }).join('&');
  1063.     },
  1064.  
  1065.     inspect: function() {
  1066.       return '#<Hash:{' + this.map(function(pair) {
  1067.         return pair.map(Object.inspect).join(': ');
  1068.       }).join(', ') + '}>';
  1069.     },
  1070.  
  1071.     toJSON: function() {
  1072.       return Object.toJSON(this.toObject());
  1073.     },
  1074.  
  1075.     clone: function() {
  1076.       return new Hash(this);
  1077.     }
  1078.   }
  1079. })());
  1080.  
  1081. Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
  1082. Hash.from = $H;
  1083. var ObjectRange = Class.create(Enumerable, {
  1084.   initialize: function(start, end, exclusive) {
  1085.     this.start = start;
  1086.     this.end = end;
  1087.     this.exclusive = exclusive;
  1088.   },
  1089.  
  1090.   _each: function(iterator) {
  1091.     var value = this.start;
  1092.     while (this.include(value)) {
  1093.       iterator(value);
  1094.       value = value.succ();
  1095.     }
  1096.   },
  1097.  
  1098.   include: function(value) {
  1099.     if (value < this.start)
  1100.       return false;
  1101.     if (this.exclusive)
  1102.       return value < this.end;
  1103.     return value <= this.end;
  1104.   }
  1105. });
  1106.  
  1107. var $R = function(start, end, exclusive) {
  1108.   return new ObjectRange(start, end, exclusive);
  1109. };
  1110.  
  1111. var Ajax = {
  1112.   getTransport: function() {
  1113.     return Try.these(
  1114.       function() {return new XMLHttpRequest()},
  1115.       function() {return new ActiveXObject('Msxml2.XMLHTTP')},
  1116.       function() {return new ActiveXObject('Microsoft.XMLHTTP')}
  1117.     ) || false;
  1118.   },
  1119.  
  1120.   activeRequestCount: 0
  1121. };
  1122.  
  1123. Ajax.Responders = {
  1124.   responders: [],
  1125.  
  1126.   _each: function(iterator) {
  1127.     this.responders._each(iterator);
  1128.   },
  1129.  
  1130.   register: function(responder) {
  1131.     if (!this.include(responder))
  1132.       this.responders.push(responder);
  1133.   },
  1134.  
  1135.   unregister: function(responder) {
  1136.     this.responders = this.responders.without(responder);
  1137.   },
  1138.  
  1139.   dispatch: function(callback, request, transport, json) {
  1140.     this.each(function(responder) {
  1141.       if (Object.isFunction(responder[callback])) {
  1142.         try {
  1143.           responder[callback].apply(responder, [request, transport, json]);
  1144.         } catch (e) { }
  1145.       }
  1146.     });
  1147.   }
  1148. };
  1149.  
  1150. Object.extend(Ajax.Responders, Enumerable);
  1151.  
  1152. Ajax.Responders.register({
  1153.   onCreate:   function() { Ajax.activeRequestCount++ },
  1154.   onComplete: function() { Ajax.activeRequestCount-- }
  1155. });
  1156.  
  1157. Ajax.Base = Class.create({
  1158.   initialize: function(options) {
  1159.     this.options = {
  1160.       method:       'post',
  1161.       asynchronous: true,
  1162.       contentType:  'application/x-www-form-urlencoded',
  1163.       encoding:     'UTF-8',
  1164.       parameters:   '',
  1165.       evalJSON:     true,
  1166.       evalJS:       true
  1167.     };
  1168.     Object.extend(this.options, options || { });
  1169.  
  1170.     this.options.method = this.options.method.toLowerCase();
  1171.  
  1172.     if (Object.isString(this.options.parameters))
  1173.       this.options.parameters = this.options.parameters.toQueryParams();
  1174.     else if (Object.isHash(this.options.parameters))
  1175.       this.options.parameters = this.options.parameters.toObject();
  1176.   }
  1177. });
  1178.  
  1179. Ajax.Request = Class.create(Ajax.Base, {
  1180.   _complete: false,
  1181.  
  1182.   initialize: function($super, url, options) {
  1183.     $super(options);
  1184.     this.transport = Ajax.getTransport();
  1185.     this.request(url);
  1186.   },
  1187.  
  1188.   request: function(url) {
  1189.     this.url = url;
  1190.     this.method = this.options.method;
  1191.     var params = Object.clone(this.options.parameters);
  1192.  
  1193.     if (!['get', 'post'].include(this.method)) {
  1194.       // simulate other verbs over post
  1195.       params['_method'] = this.method;
  1196.       this.method = 'post';
  1197.     }
  1198.  
  1199.     this.parameters = params;
  1200.  
  1201.     if (params = Object.toQueryString(params)) {
  1202.       // when GET, append parameters to URL
  1203.       if (this.method == 'get')
  1204.         this.url += (this.url.include('?') ? '&' : '?') + params;
  1205.       else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
  1206.         params += '&_=';
  1207.     }
  1208.  
  1209.     try {
  1210.       var response = new Ajax.Response(this);
  1211.       if (this.options.onCreate) this.options.onCreate(response);
  1212.       Ajax.Responders.dispatch('onCreate', this, response);
  1213.  
  1214.       this.transport.open(this.method.toUpperCase(), this.url,
  1215.         this.options.asynchronous);
  1216.  
  1217.       if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
  1218.  
  1219.       this.transport.onreadystatechange = this.onStateChange.bind(this);
  1220.       this.setRequestHeaders();
  1221.  
  1222.       this.body = this.method == 'post' ? (this.options.postBody || params) : null;
  1223.       this.transport.send(this.body);
  1224.  
  1225.       /* Force Firefox to handle ready state 4 for synchronous requests */
  1226.       if (!this.options.asynchronous && this.transport.overrideMimeType)
  1227.         this.onStateChange();
  1228.  
  1229.     }
  1230.     catch (e) {
  1231.       this.dispatchException(e);
  1232.     }
  1233.   },
  1234.  
  1235.   onStateChange: function() {
  1236.     var readyState = this.transport.readyState;
  1237.     if (readyState > 1 && !((readyState == 4) && this._complete))
  1238.       this.respondToReadyState(this.transport.readyState);
  1239.   },
  1240.  
  1241.   setRequestHeaders: function() {
  1242.     var headers = {
  1243.       'X-Requested-With': 'XMLHttpRequest',
  1244.       'X-Prototype-Version': Prototype.Version,
  1245.       'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
  1246.     };
  1247.  
  1248.     if (this.method == 'post') {
  1249.       headers['Content-type'] = this.options.contentType +
  1250.         (this.options.encoding ? '; charset=' + this.options.encoding : '');
  1251.  
  1252.       /* Force "Connection: close" for older Mozilla browsers to work
  1253.        * around a bug where XMLHttpRequest sends an incorrect
  1254.        * Content-length header. See Mozilla Bugzilla #246651.
  1255.        */
  1256.       if (this.transport.overrideMimeType &&
  1257.           (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
  1258.             headers['Connection'] = 'close';
  1259.     }
  1260.  
  1261.     // user-defined headers
  1262.     if (typeof this.options.requestHeaders == 'object') {
  1263.       var extras = this.options.requestHeaders;
  1264.  
  1265.       if (Object.isFunction(extras.push))
  1266.         for (var i = 0, length = extras.length; i < length; i += 2)
  1267.           headers[extras[i]] = extras[i+1];
  1268.       else
  1269.         $H(extras).each(function(pair) { headers[pair.key] = pair.value });
  1270.     }
  1271.  
  1272.     for (var name in headers)
  1273.       this.transport.setRequestHeader(name, headers[name]);
  1274.   },
  1275.  
  1276.   success: function() {
  1277.     var status = this.getStatus();
  1278.     return !status || (status >= 200 && status < 300);
  1279.   },
  1280.  
  1281.   getStatus: function() {
  1282.     try {
  1283.       return this.transport.status || 0;
  1284.     } catch (e) { return 0 }
  1285.   },
  1286.  
  1287.   respondToReadyState: function(readyState) {
  1288.     var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
  1289.  
  1290.     if (state == 'Complete') {
  1291.       try {
  1292.         this._complete = true;
  1293.         (this.options['on' + response.status]
  1294.          || this.options['on' + (this.success() ? 'Success' : 'Failure')]
  1295.          || Prototype.emptyFunction)(response, response.headerJSON);
  1296.       } catch (e) {
  1297.         this.dispatchException(e);
  1298.       }
  1299.  
  1300.       var contentType = response.getHeader('Content-type');
  1301.       if (this.options.evalJS == 'force'
  1302.           || (this.options.evalJS && this.isSameOrigin() && contentType
  1303.           && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
  1304.         this.evalResponse();
  1305.     }
  1306.  
  1307.     try {
  1308.       (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
  1309.       Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
  1310.     } catch (e) {
  1311.       this.dispatchException(e);
  1312.     }
  1313.  
  1314.     if (state == 'Complete') {
  1315.       // avoid memory leak in MSIE: clean up
  1316.       this.transport.onreadystatechange = Prototype.emptyFunction;
  1317.     }
  1318.   },
  1319.  
  1320.   isSameOrigin: function() {
  1321.     var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
  1322.     return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
  1323.       protocol: location.protocol,
  1324.       domain: document.domain,
  1325.       port: location.port ? ':' + location.port : ''
  1326.     }));
  1327.   },
  1328.  
  1329.   getHeader: function(name) {
  1330.     try {
  1331.       return this.transport.getResponseHeader(name) || null;
  1332.     } catch (e) { return null }
  1333.   },
  1334.  
  1335.   evalResponse: function() {
  1336.     try {
  1337.       return eval((this.transport.responseText || '').unfilterJSON());
  1338.     } catch (e) {
  1339.       this.dispatchException(e);
  1340.     }
  1341.   },
  1342.  
  1343.   dispatchException: function(exception) {
  1344.     (this.options.onException || Prototype.emptyFunction)(this, exception);
  1345.     Ajax.Responders.dispatch('onException', this, exception);
  1346.   }
  1347. });
  1348.  
  1349. Ajax.Request.Events =
  1350.   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
  1351.  
  1352. Ajax.Response = Class.create({
  1353.   initialize: function(request){
  1354.     this.request = request;
  1355.     var transport  = this.transport  = request.transport,
  1356.         readyState = this.readyState = transport.readyState;
  1357.  
  1358.     if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
  1359.       this.status       = this.getStatus();
  1360.       this.statusText   = this.getStatusText();
  1361.       this.responseText = String.interpret(transport.responseText);
  1362.       this.headerJSON   = this._getHeaderJSON();
  1363.     }
  1364.  
  1365.     if(readyState == 4) {
  1366.       var xml = transport.responseXML;
  1367.       this.responseXML  = Object.isUndefined(xml) ? null : xml;
  1368.       this.responseJSON = this._getResponseJSON();
  1369.     }
  1370.   },
  1371.  
  1372.   status:      0,
  1373.   statusText: '',
  1374.  
  1375.   getStatus: Ajax.Request.prototype.getStatus,
  1376.  
  1377.   getStatusText: function() {
  1378.     try {
  1379.       return this.transport.statusText || '';
  1380.     } catch (e) { return '' }
  1381.   },
  1382.  
  1383.   getHeader: Ajax.Request.prototype.getHeader,
  1384.  
  1385.   getAllHeaders: function() {
  1386.     try {
  1387.       return this.getAllResponseHeaders();
  1388.     } catch (e) { return null }
  1389.   },
  1390.  
  1391.   getResponseHeader: function(name) {
  1392.     return this.transport.getResponseHeader(name);
  1393.   },
  1394.  
  1395.   getAllResponseHeaders: function() {
  1396.     return this.transport.getAllResponseHeaders();
  1397.   },
  1398.  
  1399.   _getHeaderJSON: function() {
  1400.     var json = this.getHeader('X-JSON');
  1401.     if (!json) return null;
  1402.     json = decodeURIComponent(escape(json));
  1403.     try {
  1404.       return json.evalJSON(this.request.options.sanitizeJSON ||
  1405.         !this.request.isSameOrigin());
  1406.     } catch (e) {
  1407.       this.request.dispatchException(e);
  1408.     }
  1409.   },
  1410.  
  1411.   _getResponseJSON: function() {
  1412.     var options = this.request.options;
  1413.     if (!options.evalJSON || (options.evalJSON != 'force' &&
  1414.       !(this.getHeader('Content-type') || '').include('application/json')) ||
  1415.         this.responseText.blank())
  1416.           return null;
  1417.     try {
  1418.       return this.responseText.evalJSON(options.sanitizeJSON ||
  1419.         !this.request.isSameOrigin());
  1420.     } catch (e) {
  1421.       this.request.dispatchException(e);
  1422.     }
  1423.   }
  1424. });
  1425.  
  1426. Ajax.Updater = Class.create(Ajax.Request, {
  1427.   initialize: function($super, container, url, options) {
  1428.     this.container = {
  1429.       success: (container.success || container),
  1430.       failure: (container.failure || (container.success ? null : container))
  1431.     };
  1432.  
  1433.     options = Object.clone(options);
  1434.     var onComplete = options.onComplete;
  1435.     options.onComplete = (function(response, json) {
  1436.       this.updateContent(response.responseText);
  1437.       if (Object.isFunction(onComplete)) onComplete(response, json);
  1438.     }).bind(this);
  1439.  
  1440.     $super(url, options);
  1441.   },
  1442.  
  1443.   updateContent: function(responseText) {
  1444.     var receiver = this.container[this.success() ? 'success' : 'failure'],
  1445.         options = this.options;
  1446.  
  1447.     if (!options.evalScripts) responseText = responseText.stripScripts();
  1448.  
  1449.     if (receiver = $(receiver)) {
  1450.       if (options.insertion) {
  1451.         if (Object.isString(options.insertion)) {
  1452.           var insertion = { }; insertion[options.insertion] = responseText;
  1453.           receiver.insert(insertion);
  1454.         }
  1455.         else options.insertion(receiver, responseText);
  1456.       }
  1457.       else receiver.update(responseText);
  1458.     }
  1459.   }
  1460. });
  1461.  
  1462. Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
  1463.   initialize: function($super, container, url, options) {
  1464.     $super(options);
  1465.     this.onComplete = this.options.onComplete;
  1466.  
  1467.     this.frequency = (this.options.frequency || 2);
  1468.     this.decay = (this.options.decay || 1);
  1469.  
  1470.     this.updater = { };
  1471.     this.container = container;
  1472.     this.url = url;
  1473.  
  1474.     this.start();
  1475.   },
  1476.  
  1477.   start: function() {
  1478.     this.options.onComplete = this.updateComplete.bind(this);
  1479.     this.onTimerEvent();
  1480.   },
  1481.  
  1482.   stop: function() {
  1483.     this.updater.options.onComplete = undefined;
  1484.     clearTimeout(this.timer);
  1485.     (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
  1486.   },
  1487.  
  1488.   updateComplete: function(response) {
  1489.     if (this.options.decay) {
  1490.       this.decay = (response.responseText == this.lastText ?
  1491.         this.decay * this.options.decay : 1);
  1492.  
  1493.       this.lastText = response.responseText;
  1494.     }
  1495.     this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
  1496.   },
  1497.  
  1498.   onTimerEvent: function() {
  1499.     this.updater = new Ajax.Updater(this.container, this.url, this.options);
  1500.   }
  1501. });
  1502. function $(element) {
  1503.   if (arguments.length > 1) {
  1504.     for (var i = 0, elements = [], length = arguments.length; i < length; i++)
  1505.       elements.push($(arguments[i]));
  1506.     return elements;
  1507.   }
  1508.   if (Object.isString(element))
  1509.     element = document.getElementById(element);
  1510.   return Element.extend(element);
  1511. }
  1512.  
  1513. if (Prototype.BrowserFeatures.XPath) {
  1514.   document._getElementsByXPath = function(expression, parentElement) {
  1515.     var results = [];
  1516.     var query = document.evaluate(expression, $(parentElement) || document,
  1517.       null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
  1518.     for (var i = 0, length = query.snapshotLength; i < length; i++)
  1519.       results.push(Element.extend(query.snapshotItem(i)));
  1520.     return results;
  1521.   };
  1522. }
  1523.  
  1524. /*--------------------------------------------------------------------------*/
  1525.  
  1526. if (!window.Node) var Node = { };
  1527.  
  1528. if (!Node.ELEMENT_NODE) {
  1529.   // DOM level 2 ECMAScript Language Binding
  1530.   Object.extend(Node, {
  1531.     ELEMENT_NODE: 1,
  1532.     ATTRIBUTE_NODE: 2,
  1533.     TEXT_NODE: 3,
  1534.     CDATA_SECTION_NODE: 4,
  1535.     ENTITY_REFERENCE_NODE: 5,
  1536.     ENTITY_NODE: 6,
  1537.     PROCESSING_INSTRUCTION_NODE: 7,
  1538.     COMMENT_NODE: 8,
  1539.     DOCUMENT_NODE: 9,
  1540.     DOCUMENT_TYPE_NODE: 10,
  1541.     DOCUMENT_FRAGMENT_NODE: 11,
  1542.     NOTATION_NODE: 12
  1543.   });
  1544. }
  1545.  
  1546. (function() {
  1547.   var element = this.Element;
  1548.   this.Element = function(tagName, attributes) {
  1549.     attributes = attributes || { };
  1550.     tagName = tagName.toLowerCase();
  1551.     var cache = Element.cache;
  1552.     if (Prototype.Browser.IE && attributes.name) {
  1553.       tagName = '<' + tagName + ' name="' + attributes.name + '">';
  1554.       delete attributes.name;
  1555.       return Element.writeAttribute(document.createElement(tagName), attributes);
  1556.     }
  1557.     if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
  1558.     return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
  1559.   };
  1560.   Object.extend(this.Element, element || { });
  1561. }).call(window);
  1562.  
  1563. Element.cache = { };
  1564.  
  1565. Element.Methods = {
  1566.   visible: function(element) {
  1567.     return $(element).style.display != 'none';
  1568.   },
  1569.  
  1570.   toggle: function(element) {
  1571.     element = $(element);
  1572.     Element[Element.visible(element) ? 'hide' : 'show'](element);
  1573.     return element;
  1574.   },
  1575.  
  1576.   hide: function(element) {
  1577.     $(element).style.display = 'none';
  1578.     return element;
  1579.   },
  1580.  
  1581.   show: function(element) {
  1582.     $(element).style.display = '';
  1583.     return element;
  1584.   },
  1585.  
  1586.   remove: function(element) {
  1587.     element = $(element);
  1588.     element.parentNode.removeChild(element);
  1589.     return element;
  1590.   },
  1591.  
  1592.   update: function(element, content) {
  1593.     element = $(element);
  1594.     if (content && content.toElement) content = content.toElement();
  1595.     if (Object.isElement(content)) return element.update().insert(content);
  1596.     content = Object.toHTML(content);
  1597.     element.innerHTML = content.stripScripts();
  1598.     content.evalScripts.bind(content).defer();
  1599.     return element;
  1600.   },
  1601.  
  1602.   replace: function(element, content) {
  1603.     element = $(element);
  1604.     if (content && content.toElement) content = content.toElement();
  1605.     else if (!Object.isElement(content)) {
  1606.       content = Object.toHTML(content);
  1607.       var range = element.ownerDocument.createRange();
  1608.       range.selectNode(element);
  1609.       content.evalScripts.bind(content).defer();
  1610.       content = range.createContextualFragment(content.stripScripts());
  1611.     }
  1612.     element.parentNode.replaceChild(content, element);
  1613.     return element;
  1614.   },
  1615.  
  1616.   insert: function(element, insertions) {
  1617.     element = $(element);
  1618.  
  1619.     if (Object.isString(insertions) || Object.isNumber(insertions) ||
  1620.         Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
  1621.           insertions = {bottom:insertions};
  1622.  
  1623.     var content, insert, tagName, childNodes;
  1624.  
  1625.     for (var position in insertions) {
  1626.       content  = insertions[position];
  1627.       position = position.toLowerCase();
  1628.       insert = Element._insertionTranslations[position];
  1629.  
  1630.       if (content && content.toElement) content = content.toElement();
  1631.       if (Object.isElement(content)) {
  1632.         insert(element, content);
  1633.         continue;
  1634.       }
  1635.  
  1636.       content = Object.toHTML(content);
  1637.  
  1638.       tagName = ((position == 'before' || position == 'after')
  1639.         ? element.parentNode : element).tagName.toUpperCase();
  1640.  
  1641.       childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
  1642.  
  1643.       if (position == 'top' || position == 'after') childNodes.reverse();
  1644.       childNodes.each(insert.curry(element));
  1645.  
  1646.       content.evalScripts.bind(content).defer();
  1647.     }
  1648.  
  1649.     return element;
  1650.   },
  1651.  
  1652.   wrap: function(element, wrapper, attributes) {
  1653.     element = $(element);
  1654.     if (Object.isElement(wrapper))
  1655.       $(wrapper).writeAttribute(attributes || { });
  1656.     else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
  1657.     else wrapper = new Element('div', wrapper);
  1658.     if (element.parentNode)
  1659.       element.parentNode.replaceChild(wrapper, element);
  1660.     wrapper.appendChild(element);
  1661.     return wrapper;
  1662.   },
  1663.  
  1664.   inspect: function(element) {
  1665.     element = $(element);
  1666.     var result = '<' + element.tagName.toLowerCase();
  1667.     $H({'id': 'id', 'className': 'class'}).each(function(pair) {
  1668.       var property = pair.first(), attribute = pair.last();
  1669.       var value = (element[property] || '').toString();
  1670.       if (value) result += ' ' + attribute + '=' + value.inspect(true);
  1671.     });
  1672.     return result + '>';
  1673.   },
  1674.  
  1675.   recursivelyCollect: function(element, property) {
  1676.     element = $(element);
  1677.     var elements = [];
  1678.     while (element = element[property])
  1679.       if (element.nodeType == 1)
  1680.         elements.push(Element.extend(element));
  1681.     return elements;
  1682.   },
  1683.  
  1684.   ancestors: function(element) {
  1685.     return $(element).recursivelyCollect('parentNode');
  1686.   },
  1687.  
  1688.   descendants: function(element) {
  1689.     return $(element).select("*");
  1690.   },
  1691.  
  1692.   firstDescendant: function(element) {
  1693.     element = $(element).firstChild;
  1694.     while (element && element.nodeType != 1) element = element.nextSibling;
  1695.     return $(element);
  1696.   },
  1697.  
  1698.   immediateDescendants: function(element) {
  1699.     if (!(element = $(element).firstChild)) return [];
  1700.     while (element && element.nodeType != 1) element = element.nextSibling;
  1701.     if (element) return [element].concat($(element).nextSiblings());
  1702.     return [];
  1703.   },
  1704.  
  1705.   previousSiblings: function(element) {
  1706.     return $(element).recursivelyCollect('previousSibling');
  1707.   },
  1708.  
  1709.   nextSiblings: function(element) {
  1710.     return $(element).recursivelyCollect('nextSibling');
  1711.   },
  1712.  
  1713.   siblings: function(element) {
  1714.     element = $(element);
  1715.     return element.previousSiblings().reverse().concat(element.nextSiblings());
  1716.   },
  1717.  
  1718.   match: function(element, selector) {
  1719.     if (Object.isString(selector))
  1720.       selector = new Selector(selector);
  1721.     return selector.match($(element));
  1722.   },
  1723.  
  1724.   up: function(element, expression, index) {
  1725.     element = $(element);
  1726.     if (arguments.length == 1) return $(element.parentNode);
  1727.     var ancestors = element.ancestors();
  1728.     return Object.isNumber(expression) ? ancestors[expression] :
  1729.       Selector.findElement(ancestors, expression, index);
  1730.   },
  1731.  
  1732.   down: function(element, expression, index) {
  1733.     element = $(element);
  1734.     if (arguments.length == 1) return element.firstDescendant();
  1735.     return Object.isNumber(expression) ? element.descendants()[expression] :
  1736.       element.select(expression)[index || 0];
  1737.   },
  1738.  
  1739.   previous: function(element, expression, index) {
  1740.     element = $(element);
  1741.     if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
  1742.     var previousSiblings = element.previousSiblings();
  1743.     return Object.isNumber(expression) ? previousSiblings[expression] :
  1744.       Selector.findElement(previousSiblings, expression, index);
  1745.   },
  1746.  
  1747.   next: function(element, expression, index) {
  1748.     element = $(element);
  1749.     if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
  1750.     var nextSiblings = element.nextSiblings();
  1751.     return Object.isNumber(expression) ? nextSiblings[expression] :
  1752.       Selector.findElement(nextSiblings, expression, index);
  1753.   },
  1754.  
  1755.   select: function() {
  1756.     var args = $A(arguments), element = $(args.shift());
  1757.     return Selector.findChildElements(element, args);
  1758.   },
  1759.  
  1760.   adjacent: function() {
  1761.     var args = $A(arguments), element = $(args.shift());
  1762.     return Selector.findChildElements(element.parentNode, args).without(element);
  1763.   },
  1764.  
  1765.   identify: function(element) {
  1766.     element = $(element);
  1767.     var id = element.readAttribute('id'), self = arguments.callee;
  1768.     if (id) return id;
  1769.     do { id = 'anonymous_element_' + self.counter++ } while ($(id));
  1770.     element.writeAttribute('id', id);
  1771.     return id;
  1772.   },
  1773.  
  1774.   readAttribute: function(element, name) {
  1775.     element = $(element);
  1776.     if (Prototype.Browser.IE) {
  1777.       var t = Element._attributeTranslations.read;
  1778.       if (t.values[name]) return t.values[name](element, name);
  1779.       if (t.names[name]) name = t.names[name];
  1780.       if (name.include(':')) {
  1781.         return (!element.attributes || !element.attributes[name]) ? null :
  1782.          element.attributes[name].value;
  1783.       }
  1784.     }
  1785.     return element.getAttribute(name);
  1786.   },
  1787.  
  1788.   writeAttribute: function(element, name, value) {
  1789.     element = $(element);
  1790.     var attributes = { }, t = Element._attributeTranslations.write;
  1791.  
  1792.     if (typeof name == 'object') attributes = name;
  1793.     else attributes[name] = Object.isUndefined(value) ? true : value;
  1794.  
  1795.     for (var attr in attributes) {
  1796.       name = t.names[attr] || attr;
  1797.       value = attributes[attr];
  1798.       if (t.values[attr]) name = t.values[attr](element, value);
  1799.       if (value === false || value === null)
  1800.         element.removeAttribute(name);
  1801.       else if (value === true)
  1802.         element.setAttribute(name, name);
  1803.       else element.setAttribute(name, value);
  1804.     }
  1805.     return element;
  1806.   },
  1807.  
  1808.   getHeight: function(element) {
  1809.     return $(element).getDimensions().height;
  1810.   },
  1811.  
  1812.   getWidth: function(element) {
  1813.     return $(element).getDimensions().width;
  1814.   },
  1815.  
  1816.   classNames: function(element) {
  1817.     return new Element.ClassNames(element);
  1818.   },
  1819.  
  1820.   hasClassName: function(element, className) {
  1821.     if (!(element = $(element))) return;
  1822.     var elementClassName = element.className;
  1823.     return (elementClassName.length > 0 && (elementClassName == className ||
  1824.       new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
  1825.   },
  1826.  
  1827.   addClassName: function(element, className) {
  1828.     if (!(element = $(element))) return;
  1829.     if (!element.hasClassName(className))
  1830.       element.className += (element.className ? ' ' : '') + className;
  1831.     return element;
  1832.   },
  1833.  
  1834.   removeClassName: function(element, className) {
  1835.     if (!(element = $(element))) return;
  1836.     element.className = element.className.replace(
  1837.       new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
  1838.     return element;
  1839.   },
  1840.  
  1841.   toggleClassName: function(element, className) {
  1842.     if (!(element = $(element))) return;
  1843.     return element[element.hasClassName(className) ?
  1844.       'removeClassName' : 'addClassName'](className);
  1845.   },
  1846.  
  1847.   // removes whitespace-only text node children
  1848.   cleanWhitespace: function(element) {
  1849.     element = $(element);
  1850.     var node = element.firstChild;
  1851.     while (node) {
  1852.       var nextNode = node.nextSibling;
  1853.       if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
  1854.         element.removeChild(node);
  1855.       node = nextNode;
  1856.     }
  1857.     return element;
  1858.   },
  1859.  
  1860.   empty: function(element) {
  1861.     return $(element).innerHTML.blank();
  1862.   },
  1863.  
  1864.   descendantOf: function(element, ancestor) {
  1865.     element = $(element), ancestor = $(ancestor);
  1866.     var originalAncestor = ancestor;
  1867.  
  1868.     if (element.compareDocumentPosition)
  1869.       return (element.compareDocumentPosition(ancestor) & 8) === 8;
  1870.  
  1871.     if (element.sourceIndex && !Prototype.Browser.Opera) {
  1872.       var e = element.sourceIndex, a = ancestor.sourceIndex,
  1873.        nextAncestor = ancestor.nextSibling;
  1874.       if (!nextAncestor) {
  1875.         do { ancestor = ancestor.parentNode; }
  1876.         while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
  1877.       }
  1878.       if (nextAncestor && nextAncestor.sourceIndex)
  1879.        return (e > a && e < nextAncestor.sourceIndex);
  1880.     }
  1881.  
  1882.     while (element = element.parentNode)
  1883.       if (element == originalAncestor) return true;
  1884.     return false;
  1885.   },
  1886.  
  1887.   scrollTo: function(element) {
  1888.     element = $(element);
  1889.     var pos = element.cumulativeOffset();
  1890.     window.scrollTo(pos[0], pos[1]);
  1891.     return element;
  1892.   },
  1893.  
  1894.   getStyle: function(element, style) {
  1895.     element = $(element);
  1896.     style = style == 'float' ? 'cssFloat' : style.camelize();
  1897.     var value = element.style[style];
  1898.     if (!value) {
  1899.       var css = document.defaultView.getComputedStyle(element, null);
  1900.       value = css ? css[style] : null;
  1901.     }
  1902.     if (style == 'opacity') return value ? parseFloat(value) : 1.0;
  1903.     return value == 'auto' ? null : value;
  1904.   },
  1905.  
  1906.   getOpacity: function(element) {
  1907.     return $(element).getStyle('opacity');
  1908.   },
  1909.  
  1910.   setStyle: function(element, styles) {
  1911.     element = $(element);
  1912.     var elementStyle = element.style, match;
  1913.     if (Object.isString(styles)) {
  1914.       element.style.cssText += ';' + styles;
  1915.       return styles.include('opacity') ?
  1916.         element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
  1917.     }
  1918.     for (var property in styles)
  1919.       if (property == 'opacity') element.setOpacity(styles[property]);
  1920.       else
  1921.         elementStyle[(property == 'float' || property == 'cssFloat') ?
  1922.           (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
  1923.             property] = styles[property];
  1924.  
  1925.     return element;
  1926.   },
  1927.  
  1928.   setOpacity: function(element, value) {
  1929.     element = $(element);
  1930.     element.style.opacity = (value == 1 || value === '') ? '' :
  1931.       (value < 0.00001) ? 0 : value;
  1932.     return element;
  1933.   },
  1934.  
  1935.   getDimensions: function(element) {
  1936.     element = $(element);
  1937.     var display = $(element).getStyle('display');
  1938.     if (display != 'none' && display != null) // Safari bug
  1939.       return {width: element.offsetWidth, height: element.offsetHeight};
  1940.  
  1941.     // All *Width and *Height properties give 0 on elements with display none,
  1942.     // so enable the element temporarily
  1943.     var els = element.style;
  1944.     var originalVisibility = els.visibility;
  1945.     var originalPosition = els.position;
  1946.     var originalDisplay = els.display;
  1947.     els.visibility = 'hidden';
  1948.     els.position = 'absolute';
  1949.     els.display = 'block';
  1950.     var originalWidth = element.clientWidth;
  1951.     var originalHeight = element.clientHeight;
  1952.     els.display = originalDisplay;
  1953.     els.position = originalPosition;
  1954.     els.visibility = originalVisibility;
  1955.     return {width: originalWidth, height: originalHeight};
  1956.   },
  1957.  
  1958.   makePositioned: function(element) {
  1959.     element = $(element);
  1960.     var pos = Element.getStyle(element, 'position');
  1961.     if (pos == 'static' || !pos) {
  1962.       element._madePositioned = true;
  1963.       element.style.position = 'relative';
  1964.       // Opera returns the offset relative to the positioning context, when an
  1965.       // element is position relative but top and left have not been defined
  1966.       if (window.opera) {
  1967.         element.style.top = 0;
  1968.         element.style.left = 0;
  1969.       }
  1970.     }
  1971.     return element;
  1972.   },
  1973.  
  1974.   undoPositioned: function(element) {
  1975.     element = $(element);
  1976.     if (element._madePositioned) {
  1977.       element._madePositioned = undefined;
  1978.       element.style.position =
  1979.         element.style.top =
  1980.         element.style.left =
  1981.         element.style.bottom =
  1982.         element.style.right = '';
  1983.     }
  1984.     return element;
  1985.   },
  1986.  
  1987.   makeClipping: function(element) {
  1988.     element = $(element);
  1989.     if (element._overflow) return element;
  1990.     element._overflow = Element.getStyle(element, 'overflow') || 'auto';
  1991.     if (element._overflow !== 'hidden')
  1992.       element.style.overflow = 'hidden';
  1993.     return element;
  1994.   },
  1995.  
  1996.   undoClipping: function(element) {
  1997.     element = $(element);
  1998.     if (!element._overflow) return element;
  1999.     element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
  2000.     element._overflow = null;
  2001.     return element;
  2002.   },
  2003.  
  2004.   cumulativeOffset: function(element) {
  2005.     var valueT = 0, valueL = 0;
  2006.     do {
  2007.       valueT += element.offsetTop  || 0;
  2008.       valueL += element.offsetLeft || 0;
  2009.       element = element.offsetParent;
  2010.     } while (element);
  2011.     return Element._returnOffset(valueL, valueT);
  2012.   },
  2013.  
  2014.   positionedOffset: function(element) {
  2015.     var valueT = 0, valueL = 0;
  2016.     do {
  2017.       valueT += element.offsetTop  || 0;
  2018.       valueL += element.offsetLeft || 0;
  2019.       element = element.offsetParent;
  2020.       if (element) {
  2021.         if (element.tagName == 'BODY') break;
  2022.         var p = Element.getStyle(element, 'position');
  2023.         if (p !== 'static') break;
  2024.       }
  2025.     } while (element);
  2026.     return Element._returnOffset(valueL, valueT);
  2027.   },
  2028.  
  2029.   absolutize: function(element) {
  2030.     element = $(element);
  2031.     if (element.getStyle('position') == 'absolute') return;
  2032.     // Position.prepare(); // To be done manually by Scripty when it needs it.
  2033.  
  2034.     var offsets = element.positionedOffset();
  2035.     var top     = offsets[1];
  2036.     var left    = offsets[0];
  2037.     var width   = element.clientWidth;
  2038.     var height  = element.clientHeight;
  2039.  
  2040.     element._originalLeft   = left - parseFloat(element.style.left  || 0);
  2041.     element._originalTop    = top  - parseFloat(element.style.top || 0);
  2042.     element._originalWidth  = element.style.width;
  2043.     element._originalHeight = element.style.height;
  2044.  
  2045.     element.style.position = 'absolute';
  2046.     element.style.top    = top + 'px';
  2047.     element.style.left   = left + 'px';
  2048.     element.style.width  = width + 'px';
  2049.     element.style.height = height + 'px';
  2050.     return element;
  2051.   },
  2052.  
  2053.   relativize: function(element) {
  2054.     element = $(element);
  2055.     if (element.getStyle('position') == 'relative') return;
  2056.     // Position.prepare(); // To be done manually by Scripty when it needs it.
  2057.  
  2058.     element.style.position = 'relative';
  2059.     var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
  2060.     var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
  2061.  
  2062.     element.style.top    = top + 'px';
  2063.     element.style.left   = left + 'px';
  2064.     element.style.height = element._originalHeight;
  2065.     element.style.width  = element._originalWidth;
  2066.     return element;
  2067.   },
  2068.  
  2069.   cumulativeScrollOffset: function(element) {
  2070.     var valueT = 0, valueL = 0;
  2071.     do {
  2072.       valueT += element.scrollTop  || 0;
  2073.       valueL += element.scrollLeft || 0;
  2074.       element = element.parentNode;
  2075.     } while (element);
  2076.     return Element._returnOffset(valueL, valueT);
  2077.   },
  2078.  
  2079.   getOffsetParent: function(element) {
  2080.     if (element.offsetParent) return $(element.offsetParent);
  2081.     if (element == document.body) return $(element);
  2082.  
  2083.     while ((element = element.parentNode) && element != document.body)
  2084.       if (Element.getStyle(element, 'position') != 'static')
  2085.         return $(element);
  2086.  
  2087.     return $(document.body);
  2088.   },
  2089.  
  2090.   viewportOffset: function(forElement) {
  2091.     var valueT = 0, valueL = 0;
  2092.  
  2093.     var element = forElement;
  2094.     do {
  2095.       valueT += element.offsetTop  || 0;
  2096.       valueL += element.offsetLeft || 0;
  2097.  
  2098.       // Safari fix
  2099.       if (element.offsetParent == document.body &&
  2100.         Element.getStyle(element, 'position') == 'absolute') break;
  2101.  
  2102.     } while (element = element.offsetParent);
  2103.  
  2104.     element = forElement;
  2105.     do {
  2106.       if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
  2107.         valueT -= element.scrollTop  || 0;
  2108.         valueL -= element.scrollLeft || 0;
  2109.       }
  2110.     } while (element = element.parentNode);
  2111.  
  2112.     return Element._returnOffset(valueL, valueT);
  2113.   },
  2114.  
  2115.   clonePosition: function(element, source) {
  2116.     var options = Object.extend({
  2117.       setLeft:    true,
  2118.       setTop:     true,
  2119.       setWidth:   true,
  2120.       setHeight:  true,
  2121.       offsetTop:  0,
  2122.       offsetLeft: 0
  2123.     }, arguments[2] || { });
  2124.  
  2125.     // find page position of source
  2126.     source = $(source);
  2127.     var p = source.viewportOffset();
  2128.  
  2129.     // find coordinate system to use
  2130.     element = $(element);
  2131.     var delta = [0, 0];
  2132.     var parent = null;
  2133.     // delta [0,0] will do fine with position: fixed elements,
  2134.     // position:absolute needs offsetParent deltas
  2135.     if (Element.getStyle(element, 'position') == 'absolute') {
  2136.       parent = element.getOffsetParent();
  2137.       delta = parent.viewportOffset();
  2138.     }
  2139.  
  2140.     // correct by body offsets (fixes Safari)
  2141.     if (parent == document.body) {
  2142.       delta[0] -= document.body.offsetLeft;
  2143.       delta[1] -= document.body.offsetTop;
  2144.     }
  2145.  
  2146.     // set position
  2147.     if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
  2148.     if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
  2149.     if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
  2150.     if (options.setHeight) element.style.height = source.offsetHeight + 'px';
  2151.     return element;
  2152.   }
  2153. };
  2154.  
  2155. Element.Methods.identify.counter = 1;
  2156.  
  2157. Object.extend(Element.Methods, {
  2158.   getElementsBySelector: Element.Methods.select,
  2159.   childElements: Element.Methods.immediateDescendants
  2160. });
  2161.  
  2162. Element._attributeTranslations = {
  2163.   write: {
  2164.     names: {
  2165.       className: 'class',
  2166.       htmlFor:   'for'
  2167.     },
  2168.     values: { }
  2169.   }
  2170. };
  2171.  
  2172. if (Prototype.Browser.Opera) {
  2173.   Element.Methods.getStyle = Element.Methods.getStyle.wrap(
  2174.     function(proceed, element, style) {
  2175.       switch (style) {
  2176.         case 'left': case 'top': case 'right': case 'bottom':
  2177.           if (proceed(element, 'position') === 'static') return null;
  2178.         case 'height': case 'width':
  2179.           // returns '0px' for hidden elements; we want it to return null
  2180.           if (!Element.visible(element)) return null;
  2181.  
  2182.           // returns the border-box dimensions rather than the content-box
  2183.           // dimensions, so we subtract padding and borders from the value
  2184.           var dim = parseInt(proceed(element, style), 10);
  2185.  
  2186.           if (dim !== element['offset' + style.capitalize()])
  2187.             return dim + 'px';
  2188.  
  2189.           var properties;
  2190.           if (style === 'height') {
  2191.             properties = ['border-top-width', 'padding-top',
  2192.              'padding-bottom', 'border-bottom-width'];
  2193.           }
  2194.           else {
  2195.             properties = ['border-left-width', 'padding-left',
  2196.              'padding-right', 'border-right-width'];
  2197.           }
  2198.           return properties.inject(dim, function(memo, property) {
  2199.             var val = proceed(element, property);
  2200.             return val === null ? memo : memo - parseInt(val, 10);
  2201.           }) + 'px';
  2202.         default: return proceed(element, style);
  2203.       }
  2204.     }
  2205.   );
  2206.  
  2207.   Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
  2208.     function(proceed, element, attribute) {
  2209.       if (attribute === 'title') return element.title;
  2210.       return proceed(element, attribute);
  2211.     }
  2212.   );
  2213. }
  2214.  
  2215. else if (Prototype.Browser.IE) {
  2216.   // IE doesn't report offsets correctly for static elements, so we change them
  2217.   // to "relative" to get the values, then change them back.
  2218.   Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
  2219.     function(proceed, element) {
  2220.       element = $(element);
  2221.       var position = element.getStyle('position');
  2222.       if (position !== 'static') return proceed(element);
  2223.       element.setStyle({ position: 'relative' });
  2224.       var value = proceed(element);
  2225.       element.setStyle({ position: position });
  2226.       return value;
  2227.     }
  2228.   );
  2229.  
  2230.   $w('positionedOffset viewportOffset').each(function(method) {
  2231.     Element.Methods[method] = Element.Methods[method].wrap(
  2232.       function(proceed, element) {
  2233.         element = $(element);
  2234.         var position = element.getStyle('position');
  2235.         if (position !== 'static') return proceed(element);
  2236.         // Trigger hasLayout on the offset parent so that IE6 reports
  2237.         // accurate offsetTop and offsetLeft values for position: fixed.
  2238.         var offsetParent = element.getOffsetParent();
  2239.         if (offsetParent && offsetParent.getStyle('position') === 'fixed')
  2240.           offsetParent.setStyle({ zoom: 1 });
  2241.         element.setStyle({ position: 'relative' });
  2242.         var value = proceed(element);
  2243.         element.setStyle({ position: position });
  2244.         return value;
  2245.       }
  2246.     );
  2247.   });
  2248.  
  2249.   Element.Methods.getStyle = function(element, style) {
  2250.     element = $(element);
  2251.     style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
  2252.     var value = element.style[style];
  2253.     if (!value && element.currentStyle) value = element.currentStyle[style];
  2254.  
  2255.     if (style == 'opacity') {
  2256.       if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
  2257.         if (value[1]) return parseFloat(value[1]) / 100;
  2258.       return 1.0;
  2259.     }
  2260.  
  2261.     if (value == 'auto') {
  2262.       if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
  2263.         return element['offset' + style.capitalize()] + 'px';
  2264.       return null;
  2265.     }
  2266.     return value;
  2267.   };
  2268.  
  2269.   Element.Methods.setOpacity = function(element, value) {
  2270.     function stripAlpha(filter){
  2271.       return filter.replace(/alpha\([^\)]*\)/gi,'');
  2272.     }
  2273.     element = $(element);
  2274.     var currentStyle = element.currentStyle;
  2275.     if ((currentStyle && !currentStyle.hasLayout) ||
  2276.       (!currentStyle && element.style.zoom == 'normal'))
  2277.         element.style.zoom = 1;
  2278.  
  2279.     var filter = element.getStyle('filter'), style = element.style;
  2280.     if (value == 1 || value === '') {
  2281.       (filter = stripAlpha(filter)) ?
  2282.         style.filter = filter : style.removeAttribute('filter');
  2283.       return element;
  2284.     } else if (value < 0.00001) value = 0;
  2285.     style.filter = stripAlpha(filter) +
  2286.       'alpha(opacity=' + (value * 100) + ')';
  2287.     return element;
  2288.   };
  2289.  
  2290.   Element._attributeTranslations = {
  2291.     read: {
  2292.       names: {
  2293.         'class': 'className',
  2294.         'for':   'htmlFor'
  2295.       },
  2296.       values: {
  2297.         _getAttr: function(element, attribute) {
  2298.           return element.getAttribute(attribute, 2);
  2299.         },
  2300.         _getAttrNode: function(element, attribute) {
  2301.           var node = element.getAttributeNode(attribute);
  2302.           return node ? node.value : "";
  2303.         },
  2304.         _getEv: function(element, attribute) {
  2305.           attribute = element.getAttribute(attribute);
  2306.           return attribute ? attribute.toString().slice(23, -2) : null;
  2307.         },
  2308.         _flag: function(element, attribute) {
  2309.           return $(element).hasAttribute(attribute) ? attribute : null;
  2310.         },
  2311.         style: function(element) {
  2312.           return element.style.cssText.toLowerCase();
  2313.         },
  2314.         title: function(element) {
  2315.           return element.title;
  2316.         }
  2317.       }
  2318.     }
  2319.   };
  2320.  
  2321.   Element._attributeTranslations.write = {
  2322.     names: Object.extend({
  2323.       cellpadding: 'cellPadding',
  2324.       cellspacing: 'cellSpacing'
  2325.     }, Element._attributeTranslations.read.names),
  2326.     values: {
  2327.       checked: function(element, value) {
  2328.         element.checked = !!value;
  2329.       },
  2330.  
  2331.       style: function(element, value) {
  2332.         element.style.cssText = value ? value : '';
  2333.       }
  2334.     }
  2335.   };
  2336.  
  2337.   Element._attributeTranslations.has = {};
  2338.  
  2339.   $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
  2340.       'encType maxLength readOnly longDesc').each(function(attr) {
  2341.     Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
  2342.     Element._attributeTranslations.has[attr.toLowerCase()] = attr;
  2343.   });
  2344.  
  2345.   (function(v) {
  2346.     Object.extend(v, {
  2347.       href:        v._getAttr,
  2348.       src:         v._getAttr,
  2349.       type:        v._getAttr,
  2350.       action:      v._getAttrNode,
  2351.       disabled:    v._flag,
  2352.       checked:     v._flag,
  2353.       readonly:    v._flag,
  2354.       multiple:    v._flag,
  2355.       onload:      v._getEv,
  2356.       onunload:    v._getEv,
  2357.       onclick:     v._getEv,
  2358.       ondblclick:  v._getEv,
  2359.       onmousedown: v._getEv,
  2360.       onmouseup:   v._getEv,
  2361.       onmouseover: v._getEv,
  2362.       onmousemove: v._getEv,
  2363.       onmouseout:  v._getEv,
  2364.       onfocus:     v._getEv,
  2365.       onblur:      v._getEv,
  2366.       onkeypress:  v._getEv,
  2367.       onkeydown:   v._getEv,
  2368.       onkeyup:     v._getEv,
  2369.       onsubmit:    v._getEv,
  2370.       onreset:     v._getEv,
  2371.       onselect:    v._getEv,
  2372.       onchange:    v._getEv
  2373.     });
  2374.   })(Element._attributeTranslations.read.values);
  2375. }
  2376.  
  2377. else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
  2378.   Element.Methods.setOpacity = function(element, value) {
  2379.     element = $(element);
  2380.     element.style.opacity = (value == 1) ? 0.999999 :
  2381.       (value === '') ? '' : (value < 0.00001) ? 0 : value;
  2382.     return element;
  2383.   };
  2384. }
  2385.  
  2386. else if (Prototype.Browser.WebKit) {
  2387.   Element.Methods.setOpacity = function(element, value) {
  2388.     element = $(element);
  2389.     element.style.opacity = (value == 1 || value === '') ? '' :
  2390.       (value < 0.00001) ? 0 : value;
  2391.  
  2392.     if (value == 1)
  2393.       if(element.tagName == 'IMG' && element.width) {
  2394.         element.width++; element.width--;
  2395.       } else try {
  2396.         var n = document.createTextNode(' ');
  2397.         element.appendChild(n);
  2398.         element.removeChild(n);
  2399.       } catch (e) { }
  2400.  
  2401.     return element;
  2402.   };
  2403.  
  2404.   // Safari returns margins on body which is incorrect if the child is absolutely
  2405.   // positioned.  For performance reasons, redefine Element#cumulativeOffset for
  2406.   // KHTML/WebKit only.
  2407.   Element.Methods.cumulativeOffset = function(element) {
  2408.     var valueT = 0, valueL = 0;
  2409.     do {
  2410.       valueT += element.offsetTop  || 0;
  2411.       valueL += element.offsetLeft || 0;
  2412.       if (element.offsetParent == document.body)
  2413.         if (Element.getStyle(element, 'position') == 'absolute') break;
  2414.  
  2415.       element = element.offsetParent;
  2416.     } while (element);
  2417.  
  2418.     return Element._returnOffset(valueL, valueT);
  2419.   };
  2420. }
  2421.  
  2422. if (Prototype.Browser.IE || Prototype.Browser.Opera) {
  2423.   // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
  2424.   Element.Methods.update = function(element, content) {
  2425.     element = $(element);
  2426.  
  2427.     if (content && content.toElement) content = content.toElement();
  2428.     if (Object.isElement(content)) return element.update().insert(content);
  2429.  
  2430.     content = Object.toHTML(content);
  2431.     var tagName = element.tagName.toUpperCase();
  2432.  
  2433.     if (tagName in Element._insertionTranslations.tags) {
  2434.       $A(element.childNodes).each(function(node) { element.removeChild(node) });
  2435.       Element._getContentFromAnonymousElement(tagName, content.stripScripts())
  2436.         .each(function(node) { element.appendChild(node) });
  2437.     }
  2438.     else element.innerHTML = content.stripScripts();
  2439.  
  2440.     content.evalScripts.bind(content).defer();
  2441.     return element;
  2442.   };
  2443. }
  2444.  
  2445. if ('outerHTML' in document.createElement('div')) {
  2446.   Element.Methods.replace = function(element, content) {
  2447.     element = $(element);
  2448.  
  2449.     if (content && content.toElement) content = content.toElement();
  2450.     if (Object.isElement(content)) {
  2451.       element.parentNode.replaceChild(content, element);
  2452.       return element;
  2453.     }
  2454.  
  2455.     content = Object.toHTML(content);
  2456.     var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
  2457.  
  2458.     if (Element._insertionTranslations.tags[tagName]) {
  2459.       var nextSibling = element.next();
  2460.       var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
  2461.       parent.removeChild(element);
  2462.       if (nextSibling)
  2463.         fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
  2464.       else
  2465.         fragments.each(function(node) { parent.appendChild(node) });
  2466.     }
  2467.     else element.outerHTML = content.stripScripts();
  2468.  
  2469.     content.evalScripts.bind(content).defer();
  2470.     return element;
  2471.   };
  2472. }
  2473.  
  2474. Element._returnOffset = function(l, t) {
  2475.   var result = [l, t];
  2476.   result.left = l;
  2477.   result.top = t;
  2478.   return result;
  2479. };
  2480.  
  2481. Element._getContentFromAnonymousElement = function(tagName, html) {
  2482.   var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
  2483.   if (t) {
  2484.     div.innerHTML = t[0] + html + t[1];
  2485.     t[2].times(function() { div = div.firstChild });
  2486.   } else div.innerHTML = html;
  2487.   return $A(div.childNodes);
  2488. };
  2489.  
  2490. Element._insertionTranslations = {
  2491.   before: function(element, node) {
  2492.     element.parentNode.insertBefore(node, element);
  2493.   },
  2494.   top: function(element, node) {
  2495.     element.insertBefore(node, element.firstChild);
  2496.   },
  2497.   bottom: function(element, node) {
  2498.     element.appendChild(node);
  2499.   },
  2500.   after: function(element, node) {
  2501.     element.parentNode.insertBefore(node, element.nextSibling);
  2502.   },
  2503.   tags: {
  2504.     TABLE:  ['<table>',                '</table>',                   1],
  2505.     TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
  2506.     TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
  2507.     TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
  2508.     SELECT: ['<select>',               '</select>',                  1]
  2509.   }
  2510. };
  2511.  
  2512. (function() {
  2513.   Object.extend(this.tags, {
  2514.     THEAD: this.tags.TBODY,
  2515.     TFOOT: this.tags.TBODY,
  2516.     TH:    this.tags.TD
  2517.   });
  2518. }).call(Element._insertionTranslations);
  2519.  
  2520. Element.Methods.Simulated = {
  2521.   hasAttribute: function(element, attribute) {
  2522.     attribute = Element._attributeTranslations.has[attribute] || attribute;
  2523.     var node = $(element).getAttributeNode(attribute);
  2524.     return node && node.specified;
  2525.   }
  2526. };
  2527.  
  2528. Element.Methods.ByTag = { };
  2529.  
  2530. Object.extend(Element, Element.Methods);
  2531.  
  2532. if (!Prototype.BrowserFeatures.ElementExtensions &&
  2533.     document.createElement('div').__proto__) {
  2534.   window.HTMLElement = { };
  2535.   window.HTMLElement.prototype = document.createElement('div').__proto__;
  2536.   Prototype.BrowserFeatures.ElementExtensions = true;
  2537. }
  2538.  
  2539. Element.extend = (function() {
  2540.   if (Prototype.BrowserFeatures.SpecificElementExtensions)
  2541.     return Prototype.K;
  2542.  
  2543.   var Methods = { }, ByTag = Element.Methods.ByTag;
  2544.  
  2545.   var extend = Object.extend(function(element) {
  2546.     if (!element || element._extendedByPrototype ||
  2547.         element.nodeType != 1 || element == window) return element;
  2548.  
  2549.     var methods = Object.clone(Methods),
  2550.       tagName = element.tagName, property, value;
  2551.  
  2552.     // extend methods for specific tags
  2553.     if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
  2554.  
  2555.     for (property in methods) {
  2556.       value = methods[property];
  2557.       if (Object.isFunction(value) && !(property in element))
  2558.         element[property] = value.methodize();
  2559.     }
  2560.  
  2561.     element._extendedByPrototype = Prototype.emptyFunction;
  2562.     return element;
  2563.  
  2564.   }, {
  2565.     refresh: function() {
  2566.       // extend methods for all tags (Safari doesn't need this)
  2567.       if (!Prototype.BrowserFeatures.ElementExtensions) {
  2568.         Object.extend(Methods, Element.Methods);
  2569.         Object.extend(Methods, Element.Methods.Simulated);
  2570.       }
  2571.     }
  2572.   });
  2573.  
  2574.   extend.refresh();
  2575.   return extend;
  2576. })();
  2577.  
  2578. Element.hasAttribute = function(element, attribute) {
  2579.   if (element.hasAttribute) return element.hasAttribute(attribute);
  2580.   return Element.Methods.Simulated.hasAttribute(element, attribute);
  2581. };
  2582.  
  2583. Element.addMethods = function(methods) {
  2584.   var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
  2585.  
  2586.   if (!methods) {
  2587.     Object.extend(Form, Form.Methods);
  2588.     Object.extend(Form.Element, Form.Element.Methods);
  2589.     Object.extend(Element.Methods.ByTag, {
  2590.       "FORM":     Object.clone(Form.Methods),
  2591.       "INPUT":    Object.clone(Form.Element.Methods),
  2592.       "SELECT":   Object.clone(Form.Element.Methods),
  2593.       "TEXTAREA": Object.clone(Form.Element.Methods)
  2594.     });
  2595.   }
  2596.  
  2597.   if (arguments.length == 2) {
  2598.     var tagName = methods;
  2599.     methods = arguments[1];
  2600.   }
  2601.  
  2602.   if (!tagName) Object.extend(Element.Methods, methods || { });
  2603.   else {
  2604.     if (Object.isArray(tagName)) tagName.each(extend);
  2605.     else extend(tagName);
  2606.   }
  2607.  
  2608.   function extend(tagName) {
  2609.     tagName = tagName.toUpperCase();
  2610.     if (!Element.Methods.ByTag[tagName])
  2611.       Element.Methods.ByTag[tagName] = { };
  2612.     Object.extend(Element.Methods.ByTag[tagName], methods);
  2613.   }
  2614.  
  2615.   function copy(methods, destination, onlyIfAbsent) {
  2616.     onlyIfAbsent = onlyIfAbsent || false;
  2617.     for (var property in methods) {
  2618.       var value = methods[property];
  2619.       if (!Object.isFunction(value)) continue;
  2620.       if (!onlyIfAbsent || !(property in destination))
  2621.         destination[property] = value.methodize();
  2622.     }
  2623.   }
  2624.  
  2625.   function findDOMClass(tagName) {
  2626.     var klass;
  2627.     var trans = {
  2628.       "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
  2629.       "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
  2630.       "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
  2631.       "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
  2632.       "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
  2633.       "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
  2634.       "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
  2635.       "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
  2636.       "FrameSet", "IFRAME": "IFrame"
  2637.     };
  2638.     if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
  2639.     if (window[klass]) return window[klass];
  2640.     klass = 'HTML' + tagName + 'Element';
  2641.     if (window[klass]) return window[klass];
  2642.     klass = 'HTML' + tagName.capitalize() + 'Element';
  2643.     if (window[klass]) return window[klass];
  2644.  
  2645.     window[klass] = { };
  2646.     window[klass].prototype = document.createElement(tagName).__proto__;
  2647.     return window[klass];
  2648.   }
  2649.  
  2650.   if (F.ElementExtensions) {
  2651.     copy(Element.Methods, HTMLElement.prototype);
  2652.     copy(Element.Methods.Simulated, HTMLElement.prototype, true);
  2653.   }
  2654.  
  2655.   if (F.SpecificElementExtensions) {
  2656.     for (var tag in Element.Methods.ByTag) {
  2657.       var klass = findDOMClass(tag);
  2658.       if (Object.isUndefined(klass)) continue;
  2659.       copy(T[tag], klass.prototype);
  2660.     }
  2661.   }
  2662.  
  2663.   Object.extend(Element, Element.Methods);
  2664.   delete Element.ByTag;
  2665.  
  2666.   if (Element.extend.refresh) Element.extend.refresh();
  2667.   Element.cache = { };
  2668. };
  2669.  
  2670. document.viewport = {
  2671.   getDimensions: function() {
  2672.     var dimensions = { };
  2673.     var B = Prototype.Browser;
  2674.     $w('width height').each(function(d) {
  2675.       var D = d.capitalize();
  2676.       dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
  2677.         (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
  2678.     });
  2679.     return dimensions;
  2680.   },
  2681.  
  2682.   getWidth: function() {
  2683.     return this.getDimensions().width;
  2684.   },
  2685.  
  2686.   getHeight: function() {
  2687.     return this.getDimensions().height;
  2688.   },
  2689.  
  2690.   getScrollOffsets: function() {
  2691.     return Element._returnOffset(
  2692.       window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
  2693.       window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
  2694.   }
  2695. };
  2696. /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
  2697.  * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
  2698.  * license.  Please see http://www.yui-ext.com/ for more information. */
  2699.  
  2700. var Selector = Class.create({
  2701.   initialize: function(expression) {
  2702.     this.expression = expression.strip();
  2703.     this.compileMatcher();
  2704.   },
  2705.  
  2706.   shouldUseXPath: function() {
  2707.     if (!Prototype.BrowserFeatures.XPath) return false;
  2708.  
  2709.     var e = this.expression;
  2710.  
  2711.     // Safari 3 chokes on :*-of-type and :empty
  2712.     if (Prototype.Browser.WebKit &&
  2713.      (e.include("-of-type") || e.include(":empty")))
  2714.       return false;
  2715.  
  2716.     // XPath can't do namespaced attributes, nor can it read
  2717.     // the "checked" property from DOM nodes
  2718.     if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
  2719.       return false;
  2720.  
  2721.     return true;
  2722.   },
  2723.  
  2724.   compileMatcher: function() {
  2725.     if (this.shouldUseXPath())
  2726.       return this.compileXPathMatcher();
  2727.  
  2728.     var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
  2729.         c = Selector.criteria, le, p, m;
  2730.  
  2731.     if (Selector._cache[e]) {
  2732.       this.matcher = Selector._cache[e];
  2733.       return;
  2734.     }
  2735.  
  2736.     this.matcher = ["this.matcher = function(root) {",
  2737.                     "var r = root, h = Selector.handlers, c = false, n;"];
  2738.  
  2739.     while (e && le != e && (/\S/).test(e)) {
  2740.       le = e;
  2741.       for (var i in ps) {
  2742.         p = ps[i];
  2743.         if (m = e.match(p)) {
  2744.           this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
  2745.               new Template(c[i]).evaluate(m));
  2746.           e = e.replace(m[0], '');
  2747.           break;
  2748.         }
  2749.       }
  2750.     }
  2751.  
  2752.     this.matcher.push("return h.unique(n);\n}");
  2753.     eval(this.matcher.join('\n'));
  2754.     Selector._cache[this.expression] = this.matcher;
  2755.   },
  2756.  
  2757.   compileXPathMatcher: function() {
  2758.     var e = this.expression, ps = Selector.patterns,
  2759.         x = Selector.xpath, le, m;
  2760.  
  2761.     if (Selector._cache[e]) {
  2762.       this.xpath = Selector._cache[e]; return;
  2763.     }
  2764.  
  2765.     this.matcher = ['.//*'];
  2766.     while (e && le != e && (/\S/).test(e)) {
  2767.       le = e;
  2768.       for (var i in ps) {
  2769.         if (m = e.match(ps[i])) {
  2770.           this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
  2771.             new Template(x[i]).evaluate(m));
  2772.           e = e.replace(m[0], '');
  2773.           break;
  2774.         }
  2775.       }
  2776.     }
  2777.  
  2778.     this.xpath = this.matcher.join('');
  2779.     Selector._cache[this.expression] = this.xpath;
  2780.   },
  2781.  
  2782.   findElements: function(root) {
  2783.     root = root || document;
  2784.     if (this.xpath) return document._getElementsByXPath(this.xpath, root);
  2785.     return this.matcher(root);
  2786.   },
  2787.  
  2788.   match: function(element) {
  2789.     this.tokens = [];
  2790.  
  2791.     var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
  2792.     var le, p, m;
  2793.  
  2794.     while (e && le !== e && (/\S/).test(e)) {
  2795.       le = e;
  2796.       for (var i in ps) {
  2797.         p = ps[i];
  2798.         if (m = e.match(p)) {
  2799.           // use the Selector.assertions methods unless the selector
  2800.           // is too complex.
  2801.           if (as[i]) {
  2802.             this.tokens.push([i, Object.clone(m)]);
  2803.             e = e.replace(m[0], '');
  2804.           } else {
  2805.             // reluctantly do a document-wide search
  2806.             // and look for a match in the array
  2807.             return this.findElements(document).include(element);
  2808.           }
  2809.         }
  2810.       }
  2811.     }
  2812.  
  2813.     var match = true, name, matches;
  2814.     for (var i = 0, token; token = this.tokens[i]; i++) {
  2815.       name = token[0], matches = token[1];
  2816.       if (!Selector.assertions[name](element, matches)) {
  2817.         match = false; break;
  2818.       }
  2819.     }
  2820.  
  2821.     return match;
  2822.   },
  2823.  
  2824.   toString: function() {
  2825.     return this.expression;
  2826.   },
  2827.  
  2828.   inspect: function() {
  2829.     return "#<Selector:" + this.expression.inspect() + ">";
  2830.   }
  2831. });
  2832.  
  2833. Object.extend(Selector, {
  2834.   _cache: { },
  2835.  
  2836.   xpath: {
  2837.     descendant:   "//*",
  2838.     child:        "/*",
  2839.     adjacent:     "/following-sibling::*[1]",
  2840.     laterSibling: '/following-sibling::*',
  2841.     tagName:      function(m) {
  2842.       if (m[1] == '*') return '';
  2843.       return "[local-name()='" + m[1].toLowerCase() +
  2844.              "' or local-name()='" + m[1].toUpperCase() + "']";
  2845.     },
  2846.     className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
  2847.     id:           "[@id='#{1}']",
  2848.     attrPresence: function(m) {
  2849.       m[1] = m[1].toLowerCase();
  2850.       return new Template("[@#{1}]").evaluate(m);
  2851.     },
  2852.     attr: function(m) {
  2853.       m[1] = m[1].toLowerCase();
  2854.       m[3] = m[5] || m[6];
  2855.       return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
  2856.     },
  2857.     pseudo: function(m) {
  2858.       var h = Selector.xpath.pseudos[m[1]];
  2859.       if (!h) return '';
  2860.       if (Object.isFunction(h)) return h(m);
  2861.       return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
  2862.     },
  2863.     operators: {
  2864.       '=':  "[@#{1}='#{3}']",
  2865.       '!=': "[@#{1}!='#{3}']",
  2866.       '^=': "[starts-with(@#{1}, '#{3}')]",
  2867.       '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
  2868.       '*=': "[contains(@#{1}, '#{3}')]",
  2869.       '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
  2870.       '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
  2871.     },
  2872.     pseudos: {
  2873.       'first-child': '[not(preceding-sibling::*)]',
  2874.       'last-child':  '[not(following-sibling::*)]',
  2875.       'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
  2876.       'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
  2877.       'checked':     "[@checked]",
  2878.       'disabled':    "[@disabled]",
  2879.       'enabled':     "[not(@disabled)]",
  2880.       'not': function(m) {
  2881.         var e = m[6], p = Selector.patterns,
  2882.             x = Selector.xpath, le, v;
  2883.  
  2884.         var exclusion = [];
  2885.         while (e && le != e && (/\S/).test(e)) {
  2886.           le = e;
  2887.           for (var i in p) {
  2888.             if (m = e.match(p[i])) {
  2889.               v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
  2890.               exclusion.push("(" + v.substring(1, v.length - 1) + ")");
  2891.               e = e.replace(m[0], '');
  2892.               break;
  2893.             }
  2894.           }
  2895.         }
  2896.         return "[not(" + exclusion.join(" and ") + ")]";
  2897.       },
  2898.       'nth-child':      function(m) {
  2899.         return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
  2900.       },
  2901.       'nth-last-child': function(m) {
  2902.         return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
  2903.       },
  2904.       'nth-of-type':    function(m) {
  2905.         return Selector.xpath.pseudos.nth("position() ", m);
  2906.       },
  2907.       'nth-last-of-type': function(m) {
  2908.         return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
  2909.       },
  2910.       'first-of-type':  function(m) {
  2911.         m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
  2912.       },
  2913.       'last-of-type':   function(m) {
  2914.         m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
  2915.       },
  2916.       'only-of-type':   function(m) {
  2917.         var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
  2918.       },
  2919.       nth: function(fragment, m) {
  2920.         var mm, formula = m[6], predicate;
  2921.         if (formula == 'even') formula = '2n+0';
  2922.         if (formula == 'odd')  formula = '2n+1';
  2923.         if (mm = formula.match(/^(\d+)$/)) // digit only
  2924.           return '[' + fragment + "= " + mm[1] + ']';
  2925.         if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
  2926.           if (mm[1] == "-") mm[1] = -1;
  2927.           var a = mm[1] ? Number(mm[1]) : 1;
  2928.           var b = mm[2] ? Number(mm[2]) : 0;
  2929.           predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
  2930.           "((#{fragment} - #{b}) div #{a} >= 0)]";
  2931.           return new Template(predicate).evaluate({
  2932.             fragment: fragment, a: a, b: b });
  2933.         }
  2934.       }
  2935.     }
  2936.   },
  2937.  
  2938.   criteria: {
  2939.     tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
  2940.     className:    'n = h.className(n, r, "#{1}", c);    c = false;',
  2941.     id:           'n = h.id(n, r, "#{1}", c);           c = false;',
  2942.     attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
  2943.     attr: function(m) {
  2944.       m[3] = (m[5] || m[6]);
  2945.       return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
  2946.     },
  2947.     pseudo: function(m) {
  2948.       if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
  2949.       return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
  2950.     },
  2951.     descendant:   'c = "descendant";',
  2952.     child:        'c = "child";',
  2953.     adjacent:     'c = "adjacent";',
  2954.     laterSibling: 'c = "laterSibling";'
  2955.   },
  2956.  
  2957.   patterns: {
  2958.     // combinators must be listed first
  2959.     // (and descendant needs to be last combinator)
  2960.     laterSibling: /^\s*~\s*/,
  2961.     child:        /^\s*>\s*/,
  2962.     adjacent:     /^\s*\+\s*/,
  2963.     descendant:   /^\s/,
  2964.  
  2965.     // selectors follow
  2966.     tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
  2967.     id:           /^#([\w\-\*]+)(\b|$)/,
  2968.     className:    /^\.([\w\-\*]+)(\b|$)/,
  2969.     pseudo:
  2970. /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
  2971.     attrPresence: /^\[([\w]+)\]/,
  2972.     attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
  2973.   },
  2974.  
  2975.   // for Selector.match and Element#match
  2976.   assertions: {
  2977.     tagName: function(element, matches) {
  2978.       return matches[1].toUpperCase() == element.tagName.toUpperCase();
  2979.     },
  2980.  
  2981.     className: function(element, matches) {
  2982.       return Element.hasClassName(element, matches[1]);
  2983.     },
  2984.  
  2985.     id: function(element, matches) {
  2986.       return element.id === matches[1];
  2987.     },
  2988.  
  2989.     attrPresence: function(element, matches) {
  2990.       return Element.hasAttribute(element, matches[1]);
  2991.     },
  2992.  
  2993.     attr: function(element, matches) {
  2994.       var nodeValue = Element.readAttribute(element, matches[1]);
  2995.       return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
  2996.     }
  2997.   },
  2998.  
  2999.   handlers: {
  3000.     // UTILITY FUNCTIONS
  3001.     // joins two collections
  3002.     concat: function(a, b) {
  3003.       for (var i = 0, node; node = b[i]; i++)
  3004.         a.push(node);
  3005.       return a;
  3006.     },
  3007.  
  3008.     // marks an array of nodes for counting
  3009.     mark: function(nodes) {
  3010.       var _true = Prototype.emptyFunction;
  3011.       for (var i = 0, node; node = nodes[i]; i++)
  3012.         node._countedByPrototype = _true;
  3013.       return nodes;
  3014.     },
  3015.  
  3016.     unmark: function(nodes) {
  3017.       for (var i = 0, node; node = nodes[i]; i++)
  3018.         node._countedByPrototype = undefined;
  3019.       return nodes;
  3020.     },
  3021.  
  3022.     // mark each child node with its position (for nth calls)
  3023.     // "ofType" flag indicates whether we're indexing for nth-of-type
  3024.     // rather than nth-child
  3025.     index: function(parentNode, reverse, ofType) {
  3026.       parentNode._countedByPrototype = Prototype.emptyFunction;
  3027.       if (reverse) {
  3028.         for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
  3029.           var node = nodes[i];
  3030.           if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
  3031.         }
  3032.       } else {
  3033.         for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
  3034.           if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
  3035.       }
  3036.     },
  3037.  
  3038.     // filters out duplicates and extends all nodes
  3039.     unique: function(nodes) {
  3040.       if (nodes.length == 0) return nodes;
  3041.       var results = [], n;
  3042.       for (var i = 0, l = nodes.length; i < l; i++)
  3043.         if (!(n = nodes[i])._countedByPrototype) {
  3044.           n._countedByPrototype = Prototype.emptyFunction;
  3045.           results.push(Element.extend(n));
  3046.         }
  3047.       return Selector.handlers.unmark(results);
  3048.     },
  3049.  
  3050.     // COMBINATOR FUNCTIONS
  3051.     descendant: function(nodes) {
  3052.       var h = Selector.handlers;
  3053.       for (var i = 0, results = [], node; node = nodes[i]; i++)
  3054.         h.concat(results, node.getElementsByTagName('*'));
  3055.       return results;
  3056.     },
  3057.  
  3058.     child: function(nodes) {
  3059.       var h = Selector.handlers;
  3060.       for (var i = 0, results = [], node; node = nodes[i]; i++) {
  3061.         for (var j = 0, child; child = node.childNodes[j]; j++)
  3062.           if (child.nodeType == 1 && child.tagName != '!') results.push(child);
  3063.       }
  3064.       return results;
  3065.     },
  3066.  
  3067.     adjacent: function(nodes) {
  3068.       for (var i = 0, results = [], node; node = nodes[i]; i++) {
  3069.         var next = this.nextElementSibling(node);
  3070.         if (next) results.push(next);
  3071.       }
  3072.       return results;
  3073.     },
  3074.  
  3075.     laterSibling: function(nodes) {
  3076.       var h = Selector.handlers;
  3077.       for (var i = 0, results = [], node; node = nodes[i]; i++)
  3078.         h.concat(results, Element.nextSiblings(node));
  3079.       return results;
  3080.     },
  3081.  
  3082.     nextElementSibling: function(node) {
  3083.       while (node = node.nextSibling)
  3084.               if (node.nodeType == 1) return node;
  3085.       return null;
  3086.     },
  3087.  
  3088.     previousElementSibling: function(node) {
  3089.       while (node = node.previousSibling)
  3090.         if (node.nodeType == 1) return node;
  3091.       return null;
  3092.     },
  3093.  
  3094.     // TOKEN FUNCTIONS
  3095.     tagName: function(nodes, root, tagName, combinator) {
  3096.       var uTagName = tagName.toUpperCase();
  3097.       var results = [], h = Selector.handlers;
  3098.       if (nodes) {
  3099.         if (combinator) {
  3100.           // fastlane for ordinary descendant combinators
  3101.           if (combinator == "descendant") {
  3102.             for (var i = 0, node; node = nodes[i]; i++)
  3103.               h.concat(results, node.getElementsByTagName(tagName));
  3104.             return results;
  3105.           } else nodes = this[combinator](nodes);
  3106.           if (tagName == "*") return nodes;
  3107.         }
  3108.         for (var i = 0, node; node = nodes[i]; i++)
  3109.           if (node.tagName.toUpperCase() === uTagName) results.push(node);
  3110.         return results;
  3111.       } else return root.getElementsByTagName(tagName);
  3112.     },
  3113.  
  3114.     id: function(nodes, root, id, combinator) {
  3115.       var targetNode = $(id), h = Selector.handlers;
  3116.       if (!targetNode) return [];
  3117.       if (!nodes && root == document) return [targetNode];
  3118.       if (nodes) {
  3119.         if (combinator) {
  3120.           if (combinator == 'child') {
  3121.             for (var i = 0, node; node = nodes[i]; i++)
  3122.               if (targetNode.parentNode == node) return [targetNode];
  3123.           } else if (combinator == 'descendant') {
  3124.             for (var i = 0, node; node = nodes[i]; i++)
  3125.               if (Element.descendantOf(targetNode, node)) return [targetNode];
  3126.           } else if (combinator == 'adjacent') {
  3127.             for (var i = 0, node; node = nodes[i]; i++)
  3128.               if (Selector.handlers.previousElementSibling(targetNode) == node)
  3129.                 return [targetNode];
  3130.           } else nodes = h[combinator](nodes);
  3131.         }
  3132.         for (var i = 0, node; node = nodes[i]; i++)
  3133.           if (node == targetNode) return [targetNode];
  3134.         return [];
  3135.       }
  3136.       return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
  3137.     },
  3138.  
  3139.     className: function(nodes, root, className, combinator) {
  3140.       if (nodes && combinator) nodes = this[combinator](nodes);
  3141.       return Selector.handlers.byClassName(nodes, root, className);
  3142.     },
  3143.  
  3144.     byClassName: function(nodes, root, className) {
  3145.       if (!nodes) nodes = Selector.handlers.descendant([root]);
  3146.       var needle = ' ' + className + ' ';
  3147.       for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
  3148.         nodeClassName = node.className;
  3149.         if (nodeClassName.length == 0) continue;
  3150.         if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
  3151.           results.push(node);
  3152.       }
  3153.       return results;
  3154.     },
  3155.  
  3156.     attrPresence: function(nodes, root, attr, combinator) {
  3157.       if (!nodes) nodes = root.getElementsByTagName("*");
  3158.       if (nodes && combinator) nodes = this[combinator](nodes);
  3159.       var results = [];
  3160.       for (var i = 0, node; node = nodes[i]; i++)
  3161.         if (Element.hasAttribute(node, attr)) results.push(node);
  3162.       return results;
  3163.     },
  3164.  
  3165.     attr: function(nodes, root, attr, value, operator, combinator) {
  3166.       if (!nodes) nodes = root.getElementsByTagName("*");
  3167.       if (nodes && combinator) nodes = this[combinator](nodes);
  3168.       var handler = Selector.operators[operator], results = [];
  3169.       for (var i = 0, node; node = nodes[i]; i++) {
  3170.         var nodeValue = Element.readAttribute(node, attr);
  3171.         if (nodeValue === null) continue;
  3172.         if (handler(nodeValue, value)) results.push(node);
  3173.       }
  3174.       return results;
  3175.     },
  3176.  
  3177.     pseudo: function(nodes, name, value, root, combinator) {
  3178.       if (nodes && combinator) nodes = this[combinator](nodes);
  3179.       if (!nodes) nodes = root.getElementsByTagName("*");
  3180.       return Selector.pseudos[name](nodes, value, root);
  3181.     }
  3182.   },
  3183.  
  3184.   pseudos: {
  3185.     'first-child': function(nodes, value, root) {
  3186.       for (var i = 0, results = [], node; node = nodes[i]; i++) {
  3187.         if (Selector.handlers.previousElementSibling(node)) continue;
  3188.           results.push(node);
  3189.       }
  3190.       return results;
  3191.     },
  3192.     'last-child': function(nodes, value, root) {
  3193.       for (var i = 0, results = [], node; node = nodes[i]; i++) {
  3194.         if (Selector.handlers.nextElementSibling(node)) continue;
  3195.           results.push(node);
  3196.       }
  3197.       return results;
  3198.     },
  3199.     'only-child': function(nodes, value, root) {
  3200.       var h = Selector.handlers;
  3201.       for (var i = 0, results = [], node; node = nodes[i]; i++)
  3202.         if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
  3203.           results.push(node);
  3204.       return results;
  3205.     },
  3206.     'nth-child':        function(nodes, formula, root) {
  3207.       return Selector.pseudos.nth(nodes, formula, root);
  3208.     },
  3209.     'nth-last-child':   function(nodes, formula, root) {
  3210.       return Selector.pseudos.nth(nodes, formula, root, true);
  3211.     },
  3212.     'nth-of-type':      function(nodes, formula, root) {
  3213.       return Selector.pseudos.nth(nodes, formula, root, false, true);
  3214.     },
  3215.     'nth-last-of-type': function(nodes, formula, root) {
  3216.       return Selector.pseudos.nth(nodes, formula, root, true, true);
  3217.     },
  3218.     'first-of-type':    function(nodes, formula, root) {
  3219.       return Selector.pseudos.nth(nodes, "1", root, false, true);
  3220.     },
  3221.     'last-of-type':     function(nodes, formula, root) {
  3222.       return Selector.pseudos.nth(nodes, "1", root, true, true);
  3223.     },
  3224.     'only-of-type':     function(nodes, formula, root) {
  3225.       var p = Selector.pseudos;
  3226.       return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
  3227.     },
  3228.  
  3229.     // handles the an+b logic
  3230.     getIndices: function(a, b, total) {
  3231.       if (a == 0) return b > 0 ? [b] : [];
  3232.       return $R(1, total).inject([], function(memo, i) {
  3233.         if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
  3234.         return memo;
  3235.       });
  3236.     },
  3237.  
  3238.     // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
  3239.     nth: function(nodes, formula, root, reverse, ofType) {
  3240.       if (nodes.length == 0) return [];
  3241.       if (formula == 'even') formula = '2n+0';
  3242.       if (formula == 'odd')  formula = '2n+1';
  3243.       var h = Selector.handlers, results = [], indexed = [], m;
  3244.       h.mark(nodes);
  3245.       for (var i = 0, node; node = nodes[i]; i++) {
  3246.         if (!node.parentNode._countedByPrototype) {
  3247.           h.index(node.parentNode, reverse, ofType);
  3248.           indexed.push(node.parentNode);
  3249.         }
  3250.       }
  3251.       if (formula.match(/^\d+$/)) { // just a number
  3252.         formula = Number(formula);
  3253.         for (var i = 0, node; node = nodes[i]; i++)
  3254.           if (node.nodeIndex == formula) results.push(node);
  3255.       } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
  3256.         if (m[1] == "-") m[1] = -1;
  3257.         var a = m[1] ? Number(m[1]) : 1;
  3258.         var b = m[2] ? Number(m[2]) : 0;
  3259.         var indices = Selector.pseudos.getIndices(a, b, nodes.length);
  3260.         for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
  3261.           for (var j = 0; j < l; j++)
  3262.             if (node.nodeIndex == indices[j]) results.push(node);
  3263.         }
  3264.       }
  3265.       h.unmark(nodes);
  3266.       h.unmark(indexed);
  3267.       return results;
  3268.     },
  3269.  
  3270.     'empty': function(nodes, value, root) {
  3271.       for (var i = 0, results = [], node; node = nodes[i]; i++) {
  3272.         // IE treats comments as element nodes
  3273.         if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
  3274.         results.push(node);
  3275.       }
  3276.       return results;
  3277.     },
  3278.  
  3279.     'not': function(nodes, selector, root) {
  3280.       var h = Selector.handlers, selectorType, m;
  3281.       var exclusions = new Selector(selector).findElements(root);
  3282.       h.mark(exclusions);
  3283.       for (var i = 0, results = [], node; node = nodes[i]; i++)
  3284.         if (!node._countedByPrototype) results.push(node);
  3285.       h.unmark(exclusions);
  3286.       return results;
  3287.     },
  3288.  
  3289.     'enabled': function(nodes, value, root) {
  3290.       for (var i = 0, results = [], node; node = nodes[i]; i++)
  3291.         if (!node.disabled) results.push(node);
  3292.       return results;
  3293.     },
  3294.  
  3295.     'disabled': function(nodes, value, root) {
  3296.       for (var i = 0, results = [], node; node = nodes[i]; i++)
  3297.         if (node.disabled) results.push(node);
  3298.       return results;
  3299.     },
  3300.  
  3301.     'checked': function(nodes, value, root) {
  3302.       for (var i = 0, results = [], node; node = nodes[i]; i++)
  3303.         if (node.checked) results.push(node);
  3304.       return results;
  3305.     }
  3306.   },
  3307.  
  3308.   operators: {
  3309.     '=':  function(nv, v) { return nv == v; },
  3310.     '!=': function(nv, v) { return nv != v; },
  3311.     '^=': function(nv, v) { return nv.startsWith(v); },
  3312.     '$=': function(nv, v) { return nv.endsWith(v); },
  3313.     '*=': function(nv, v) { return nv.include(v); },
  3314.     '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
  3315.     '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
  3316.   },
  3317.  
  3318.   split: function(expression) {
  3319.     var expressions = [];
  3320.     expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
  3321.       expressions.push(m[1].strip());
  3322.     });
  3323.     return expressions;
  3324.   },
  3325.  
  3326.   matchElements: function(elements, expression) {
  3327.     var matches = $$(expression), h = Selector.handlers;
  3328.     h.mark(matches);
  3329.     for (var i = 0, results = [], element; element = elements[i]; i++)
  3330.       if (element._countedByPrototype) results.push(element);
  3331.     h.unmark(matches);
  3332.     return results;
  3333.   },
  3334.  
  3335.   findElement: function(elements, expression, index) {
  3336.     if (Object.isNumber(expression)) {
  3337.       index = expression; expression = false;
  3338.     }
  3339.     return Selector.matchElements(elements, expression || '*')[index || 0];
  3340.   },
  3341.  
  3342.   findChildElements: function(element, expressions) {
  3343.     expressions = Selector.split(expressions.join(','));
  3344.     var results = [], h = Selector.handlers;
  3345.     for (var i = 0, l = expressions.length, selector; i < l; i++) {
  3346.       selector = new Selector(expressions[i].strip());
  3347.       h.concat(results, selector.findElements(element));
  3348.     }
  3349.     return (l > 1) ? h.unique(results) : results;
  3350.   }
  3351. });
  3352.  
  3353. if (Prototype.Browser.IE) {
  3354.   Object.extend(Selector.handlers, {
  3355.     // IE returns comment nodes on getElementsByTagName("*").
  3356.     // Filter them out.
  3357.     concat: function(a, b) {
  3358.       for (var i = 0, node; node = b[i]; i++)
  3359.         if (node.tagName !== "!") a.push(node);
  3360.       return a;
  3361.     },
  3362.  
  3363.     // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
  3364.     unmark: function(nodes) {
  3365.       for (var i = 0, node; node = nodes[i]; i++)
  3366.         node.removeAttribute('_countedByPrototype');
  3367.       return nodes;
  3368.     }
  3369.   });
  3370. }
  3371.  
  3372. function $$() {
  3373.   return Selector.findChildElements(document, $A(arguments));
  3374. }
  3375. var Form = {
  3376.   reset: function(form) {
  3377.     $(form).reset();
  3378.     return form;
  3379.   },
  3380.  
  3381.   serializeElements: function(elements, options) {
  3382.     if (typeof options != 'object') options = { hash: !!options };
  3383.     else if (Object.isUndefined(options.hash)) options.hash = true;
  3384.     var key, value, submitted = false, submit = options.submit;
  3385.  
  3386.     var data = elements.inject({ }, function(result, element) {
  3387.       if (!element.disabled && element.name) {
  3388.         key = element.name; value = $(element).getValue();
  3389.         if (value != null && (element.type != 'submit' || (!submitted &&
  3390.             submit !== false && (!submit || key == submit) && (submitted = true)))) {
  3391.           if (key in result) {
  3392.             // a key is already present; construct an array of values
  3393.             if (!Object.isArray(result[key])) result[key] = [result[key]];
  3394.             result[key].push(value);
  3395.           }
  3396.           else result[key] = value;
  3397.         }
  3398.       }
  3399.       return result;
  3400.     });
  3401.  
  3402.     return options.hash ? data : Object.toQueryString(data);
  3403.   }
  3404. };
  3405.  
  3406. Form.Methods = {
  3407.   serialize: function(form, options) {
  3408.     return Form.serializeElements(Form.getElements(form), options);
  3409.   },
  3410.  
  3411.   getElements: function(form) {
  3412.     return $A($(form).getElementsByTagName('*')).inject([],
  3413.       function(elements, child) {
  3414.         if (Form.Element.Serializers[child.tagName.toLowerCase()])
  3415.           elements.push(Element.extend(child));
  3416.         return elements;
  3417.       }
  3418.     );
  3419.   },
  3420.  
  3421.   getInputs: function(form, typeName, name) {
  3422.     form = $(form);
  3423.     var inputs = form.getElementsByTagName('input');
  3424.  
  3425.     if (!typeName && !name) return $A(inputs).map(Element.extend);
  3426.  
  3427.     for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
  3428.       var input = inputs[i];
  3429.       if ((typeName && input.type != typeName) || (name && input.name != name))
  3430.         continue;
  3431.       matchingInputs.push(Element.extend(input));
  3432.     }
  3433.  
  3434.     return matchingInputs;
  3435.   },
  3436.  
  3437.   disable: function(form) {
  3438.     form = $(form);
  3439.     Form.getElements(form).invoke('disable');
  3440.     return form;
  3441.   },
  3442.  
  3443.   enable: function(form) {
  3444.     form = $(form);
  3445.     Form.getElements(form).invoke('enable');
  3446.     return form;
  3447.   },
  3448.  
  3449.   findFirstElement: function(form) {
  3450.     var elements = $(form).getElements().findAll(function(element) {
  3451.       return 'hidden' != element.type && !element.disabled;
  3452.     });
  3453.     var firstByIndex = elements.findAll(function(element) {
  3454.       return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
  3455.     }).sortBy(function(element) { return element.tabIndex }).first();
  3456.  
  3457.     return firstByIndex ? firstByIndex : elements.find(function(element) {
  3458.       return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
  3459.     });
  3460.   },
  3461.  
  3462.   focusFirstElement: function(form) {
  3463.     form = $(form);
  3464.     form.findFirstElement().activate();
  3465.     return form;
  3466.   },
  3467.  
  3468.   request: function(form, options) {
  3469.     form = $(form), options = Object.clone(options || { });
  3470.  
  3471.     var params = options.parameters, action = form.readAttribute('action') || '';
  3472.     if (action.blank()) action = window.location.href;
  3473.     options.parameters = form.serialize(true);
  3474.  
  3475.     if (params) {
  3476.       if (Object.isString(params)) params = params.toQueryParams();
  3477.       Object.extend(options.parameters, params);
  3478.     }
  3479.  
  3480.     if (form.hasAttribute('method') && !options.method)
  3481.       options.method = form.method;
  3482.  
  3483.     return new Ajax.Request(action, options);
  3484.   }
  3485. };
  3486.  
  3487. /*--------------------------------------------------------------------------*/
  3488.  
  3489. Form.Element = {
  3490.   focus: function(element) {
  3491.     $(element).focus();
  3492.     return element;
  3493.   },
  3494.  
  3495.   select: function(element) {
  3496.     $(element).select();
  3497.     return element;
  3498.   }
  3499. };
  3500.  
  3501. Form.Element.Methods = {
  3502.   serialize: function(element) {
  3503.     element = $(element);
  3504.     if (!element.disabled && element.name) {
  3505.       var value = element.getValue();
  3506.       if (value != undefined) {
  3507.         var pair = { };
  3508.         pair[element.name] = value;
  3509.         return Object.toQueryString(pair);
  3510.       }
  3511.     }
  3512.     return '';
  3513.   },
  3514.  
  3515.   getValue: function(element) {
  3516.     element = $(element);
  3517.     var method = element.tagName.toLowerCase();
  3518.     return Form.Element.Serializers[method](element);
  3519.   },
  3520.  
  3521.   setValue: function(element, value) {
  3522.     element = $(element);
  3523.     var method = element.tagName.toLowerCase();
  3524.     Form.Element.Serializers[method](element, value);
  3525.     return element;
  3526.   },
  3527.  
  3528.   clear: function(element) {
  3529.     $(element).value = '';
  3530.     return element;
  3531.   },
  3532.  
  3533.   present: function(element) {
  3534.     return $(element).value != '';
  3535.   },
  3536.  
  3537.   activate: function(element) {
  3538.     element = $(element);
  3539.     try {
  3540.       element.focus();
  3541.       if (element.select && (element.tagName.toLowerCase() != 'input' ||
  3542.           !['button', 'reset', 'submit'].include(element.type)))
  3543.         element.select();
  3544.     } catch (e) { }
  3545.     return element;
  3546.   },
  3547.  
  3548.   disable: function(element) {
  3549.     element = $(element);
  3550.     element.blur();
  3551.     element.disabled = true;
  3552.     return element;
  3553.   },
  3554.  
  3555.   enable: function(element) {
  3556.     element = $(element);
  3557.     element.disabled = false;
  3558.     return element;
  3559.   }
  3560. };
  3561.  
  3562. /*--------------------------------------------------------------------------*/
  3563.  
  3564. var Field = Form.Element;
  3565. var $F = Form.Element.Methods.getValue;
  3566.  
  3567. /*--------------------------------------------------------------------------*/
  3568.  
  3569. Form.Element.Serializers = {
  3570.   input: function(element, value) {
  3571.     switch (element.type.toLowerCase()) {
  3572.       case 'checkbox':
  3573.       case 'radio':
  3574.         return Form.Element.Serializers.inputSelector(element, value);
  3575.       default:
  3576.         return Form.Element.Serializers.textarea(element, value);
  3577.     }
  3578.   },
  3579.  
  3580.   inputSelector: function(element, value) {
  3581.     if (Object.isUndefined(value)) return element.checked ? element.value : null;
  3582.     else element.checked = !!value;
  3583.   },
  3584.  
  3585.   textarea: function(element, value) {
  3586.     if (Object.isUndefined(value)) return element.value;
  3587.     else element.value = value;
  3588.   },
  3589.  
  3590.   select: function(element, index) {
  3591.     if (Object.isUndefined(index))
  3592.       return this[element.type == 'select-one' ?
  3593.         'selectOne' : 'selectMany'](element);
  3594.     else {
  3595.       var opt, value, single = !Object.isArray(index);
  3596.       for (var i = 0, length = element.length; i < length; i++) {
  3597.         opt = element.options[i];
  3598.         value = this.optionValue(opt);
  3599.         if (single) {
  3600.           if (value == index) {
  3601.             opt.selected = true;
  3602.             return;
  3603.           }
  3604.         }
  3605.         else opt.selected = index.include(value);
  3606.       }
  3607.     }
  3608.   },
  3609.  
  3610.   selectOne: function(element) {
  3611.     var index = element.selectedIndex;
  3612.     return index >= 0 ? this.optionValue(element.options[index]) : null;
  3613.   },
  3614.  
  3615.   selectMany: function(element) {
  3616.     var values, length = element.length;
  3617.     if (!length) return null;
  3618.  
  3619.     for (var i = 0, values = []; i < length; i++) {
  3620.       var opt = element.options[i];
  3621.       if (opt.selected) values.push(this.optionValue(opt));
  3622.     }
  3623.     return values;
  3624.   },
  3625.  
  3626.   optionValue: function(opt) {
  3627.     // extend element because hasAttribute may not be native
  3628.     return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
  3629.   }
  3630. };
  3631.  
  3632. /*--------------------------------------------------------------------------*/
  3633.  
  3634. Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
  3635.   initialize: function($super, element, frequency, callback) {
  3636.     $super(callback, frequency);
  3637.     this.element   = $(element);
  3638.     this.lastValue = this.getValue();
  3639.   },
  3640.  
  3641.   execute: function() {
  3642.     var value = this.getValue();
  3643.     if (Object.isString(this.lastValue) && Object.isString(value) ?
  3644.         this.lastValue != value : String(this.lastValue) != String(value)) {
  3645.       this.callback(this.element, value);
  3646.       this.lastValue = value;
  3647.     }
  3648.   }
  3649. });
  3650.  
  3651. Form.Element.Observer = Class.create(Abstract.TimedObserver, {
  3652.   getValue: function() {
  3653.     return Form.Element.getValue(this.element);
  3654.   }
  3655. });
  3656.  
  3657. Form.Observer = Class.create(Abstract.TimedObserver, {
  3658.   getValue: function() {
  3659.     return Form.serialize(this.element);
  3660.   }
  3661. });
  3662.  
  3663. /*--------------------------------------------------------------------------*/
  3664.  
  3665. Abstract.EventObserver = Class.create({
  3666.   initialize: function(element, callback) {
  3667.     this.element  = $(element);
  3668.     this.callback = callback;
  3669.  
  3670.     this.lastValue = this.getValue();
  3671.     if (this.element.tagName.toLowerCase() == 'form')
  3672.       this.registerFormCallbacks();
  3673.     else
  3674.       this.registerCallback(this.element);
  3675.   },
  3676.  
  3677.   onElementEvent: function() {
  3678.     var value = this.getValue();
  3679.     if (this.lastValue != value) {
  3680.       this.callback(this.element, value);
  3681.       this.lastValue = value;
  3682.     }
  3683.   },
  3684.  
  3685.   registerFormCallbacks: function() {
  3686.     Form.getElements(this.element).each(this.registerCallback, this);
  3687.   },
  3688.  
  3689.   registerCallback: function(element) {
  3690.     if (element.type) {
  3691.       switch (element.type.toLowerCase()) {
  3692.         case 'checkbox':
  3693.         case 'radio':
  3694.           Event.observe(element, 'click', this.onElementEvent.bind(this));
  3695.           break;
  3696.         default:
  3697.           Event.observe(element, 'change', this.onElementEvent.bind(this));
  3698.           break;
  3699.       }
  3700.     }
  3701.   }
  3702. });
  3703.  
  3704. Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
  3705.   getValue: function() {
  3706.     return Form.Element.getValue(this.element);
  3707.   }
  3708. });
  3709.  
  3710. Form.EventObserver = Class.create(Abstract.EventObserver, {
  3711.   getValue: function() {
  3712.     return Form.serialize(this.element);
  3713.   }
  3714. });
  3715. if (!window.Event) var Event = { };
  3716.  
  3717. Object.extend(Event, {
  3718.   KEY_BACKSPACE: 8,
  3719.   KEY_TAB:       9,
  3720.   KEY_RETURN:   13,
  3721.   KEY_ESC:      27,
  3722.   KEY_LEFT:     37,
  3723.   KEY_UP:       38,
  3724.   KEY_RIGHT:    39,
  3725.   KEY_DOWN:     40,
  3726.   KEY_DELETE:   46,
  3727.   KEY_HOME:     36,
  3728.   KEY_END:      35,
  3729.   KEY_PAGEUP:   33,
  3730.   KEY_PAGEDOWN: 34,
  3731.   KEY_INSERT:   45,
  3732.  
  3733.   cache: { },
  3734.  
  3735.   relatedTarget: function(event) {
  3736.     var element;
  3737.     switch(event.type) {
  3738.       case 'mouseover': element = event.fromElement; break;
  3739.       case 'mouseout':  element = event.toElement;   break;
  3740.       default: return null;
  3741.     }
  3742.     return Element.extend(element);
  3743.   }
  3744. });
  3745.  
  3746. Event.Methods = (function() {
  3747.   var isButton;
  3748.  
  3749.   if (Prototype.Browser.IE) {
  3750.     var buttonMap = { 0: 1, 1: 4, 2: 2 };
  3751.     isButton = function(event, code) {
  3752.       return event.button == buttonMap[code];
  3753.     };
  3754.  
  3755.   } else if (Prototype.Browser.WebKit) {
  3756.     isButton = function(event, code) {
  3757.       switch (code) {
  3758.         case 0: return event.which == 1 && !event.metaKey;
  3759.         case 1: return event.which == 1 && event.metaKey;
  3760.         default: return false;
  3761.       }
  3762.     };
  3763.  
  3764.   } else {
  3765.     isButton = function(event, code) {
  3766.       return event.which ? (event.which === code + 1) : (event.button === code);
  3767.     };
  3768.   }
  3769.  
  3770.   return {
  3771.     isLeftClick:   function(event) { return isButton(event, 0) },
  3772.     isMiddleClick: function(event) { return isButton(event, 1) },
  3773.     isRightClick:  function(event) { return isButton(event, 2) },
  3774.  
  3775.     element: function(event) {
  3776.       var node = Event.extend(event).target;
  3777.       return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
  3778.     },
  3779.  
  3780.     findElement: function(event, expression) {
  3781.       var element = Event.element(event);
  3782.       if (!expression) return element;
  3783.       var elements = [element].concat(element.ancestors());
  3784.       return Selector.findElement(elements, expression, 0);
  3785.     },
  3786.  
  3787.     pointer: function(event) {
  3788.       return {
  3789.         x: event.pageX || (event.clientX +
  3790.           (document.documentElement.scrollLeft || document.body.scrollLeft)),
  3791.         y: event.pageY || (event.clientY +
  3792.           (document.documentElement.scrollTop || document.body.scrollTop))
  3793.       };
  3794.     },
  3795.  
  3796.     pointerX: function(event) { return Event.pointer(event).x },
  3797.     pointerY: function(event) { return Event.pointer(event).y },
  3798.  
  3799.     stop: function(event) {
  3800.       Event.extend(event);
  3801.       event.preventDefault();
  3802.       event.stopPropagation();
  3803.       event.stopped = true;
  3804.     }
  3805.   };
  3806. })();
  3807.  
  3808. Event.extend = (function() {
  3809.   var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
  3810.     m[name] = Event.Methods[name].methodize();
  3811.     return m;
  3812.   });
  3813.  
  3814.   if (Prototype.Browser.IE) {
  3815.     Object.extend(methods, {
  3816.       stopPropagation: function() { this.cancelBubble = true },
  3817.       preventDefault:  function() { this.returnValue = false },
  3818.       inspect: function() { return "[object Event]" }
  3819.     });
  3820.  
  3821.     return function(event) {
  3822.       if (!event) return false;
  3823.       if (event._extendedByPrototype) return event;
  3824.  
  3825.       event._extendedByPrototype = Prototype.emptyFunction;
  3826.       var pointer = Event.pointer(event);
  3827.       Object.extend(event, {
  3828.         target: event.srcElement,
  3829.         relatedTarget: Event.relatedTarget(event),
  3830.         pageX:  pointer.x,
  3831.         pageY:  pointer.y
  3832.       });
  3833.       return Object.extend(event, methods);
  3834.     };
  3835.  
  3836.   } else {
  3837.     Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
  3838.     Object.extend(Event.prototype, methods);
  3839.     return Prototype.K;
  3840.   }
  3841. })();
  3842.  
  3843. Object.extend(Event, (function() {
  3844.   var cache = Event.cache;
  3845.  
  3846.   function getEventID(element) {
  3847.     if (element._prototypeEventID) return element._prototypeEventID[0];
  3848.     arguments.callee.id = arguments.callee.id || 1;
  3849.     return element._prototypeEventID = [++arguments.callee.id];
  3850.   }
  3851.  
  3852.   function getDOMEventName(eventName) {
  3853.     if (eventName && eventName.include(':')) return "dataavailable";
  3854.     return eventName;
  3855.   }
  3856.  
  3857.   function getCacheForID(id) {
  3858.     return cache[id] = cache[id] || { };
  3859.   }
  3860.  
  3861.   function getWrappersForEventName(id, eventName) {
  3862.     var c = getCacheForID(id);
  3863.     return c[eventName] = c[eventName] || [];
  3864.   }
  3865.  
  3866.   function createWrapper(element, eventName, handler) {
  3867.     var id = getEventID(element);
  3868.     var c = getWrappersForEventName(id, eventName);
  3869.     if (c.pluck("handler").include(handler)) return false;
  3870.  
  3871.     var wrapper = function(event) {
  3872.       if (!Event || !Event.extend ||
  3873.         (event.eventName && event.eventName != eventName))
  3874.           return false;
  3875.  
  3876.       Event.extend(event);
  3877.       handler.call(element, event);
  3878.     };
  3879.  
  3880.     wrapper.handler = handler;
  3881.     c.push(wrapper);
  3882.     return wrapper;
  3883.   }
  3884.  
  3885.   function findWrapper(id, eventName, handler) {
  3886.     var c = getWrappersForEventName(id, eventName);
  3887.     return c.find(function(wrapper) { return wrapper.handler == handler });
  3888.   }
  3889.  
  3890.   function destroyWrapper(id, eventName, handler) {
  3891.     var c = getCacheForID(id);
  3892.     if (!c[eventName]) return false;
  3893.     c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
  3894.   }
  3895.  
  3896.   function destroyCache() {
  3897.     for (var id in cache)
  3898.       for (var eventName in cache[id])
  3899.         cache[id][eventName] = null;
  3900.   }
  3901.  
  3902.   if (window.attachEvent) {
  3903.     window.attachEvent("onunload", destroyCache);
  3904.   }
  3905.  
  3906.   return {
  3907.     observe: function(element, eventName, handler) {
  3908.       element = $(element);
  3909.       var name = getDOMEventName(eventName);
  3910.  
  3911.       var wrapper = createWrapper(element, eventName, handler);
  3912.       if (!wrapper) return element;
  3913.  
  3914.       if (element.addEventListener) {
  3915.         element.addEventListener(name, wrapper, false);
  3916.       } else {
  3917.         element.attachEvent("on" + name, wrapper);
  3918.       }
  3919.  
  3920.       return element;
  3921.     },
  3922.  
  3923.     stopObserving: function(element, eventName, handler) {
  3924.       element = $(element);
  3925.       var id = getEventID(element), name = getDOMEventName(eventName);
  3926.  
  3927.       if (!handler && eventName) {
  3928.         getWrappersForEventName(id, eventName).each(function(wrapper) {
  3929.           element.stopObserving(eventName, wrapper.handler);
  3930.         });
  3931.         return element;
  3932.  
  3933.       } else if (!eventName) {
  3934.         Object.keys(getCacheForID(id)).each(function(eventName) {
  3935.           element.stopObserving(eventName);
  3936.         });
  3937.         return element;
  3938.       }
  3939.  
  3940.       var wrapper = findWrapper(id, eventName, handler);
  3941.       if (!wrapper) return element;
  3942.  
  3943.       if (element.removeEventListener) {
  3944.         element.removeEventListener(name, wrapper, false);
  3945.       } else {
  3946.         element.detachEvent("on" + name, wrapper);
  3947.       }
  3948.  
  3949.       destroyWrapper(id, eventName, handler);
  3950.  
  3951.       return element;
  3952.     },
  3953.  
  3954.     fire: function(element, eventName, memo) {
  3955.       element = $(element);
  3956.       if (element == document && document.createEvent && !element.dispatchEvent)
  3957.         element = document.documentElement;
  3958.  
  3959.       var event;
  3960.       if (document.createEvent) {
  3961.         event = document.createEvent("HTMLEvents");
  3962.         event.initEvent("dataavailable", true, true);
  3963.       } else {
  3964.         event = document.createEventObject();
  3965.         event.eventType = "ondataavailable";
  3966.       }
  3967.  
  3968.       event.eventName = eventName;
  3969.       event.memo = memo || { };
  3970.  
  3971.       if (document.createEvent) {
  3972.         element.dispatchEvent(event);
  3973.       } else {
  3974.         element.fireEvent(event.eventType, event);
  3975.       }
  3976.  
  3977.       return Event.extend(event);
  3978.     }
  3979.   };
  3980. })());
  3981.  
  3982. Object.extend(Event, Event.Methods);
  3983.  
  3984. Element.addMethods({
  3985.   fire:          Event.fire,
  3986.   observe:       Event.observe,
  3987.   stopObserving: Event.stopObserving
  3988. });
  3989.  
  3990. Object.extend(document, {
  3991.   fire:          Element.Methods.fire.methodize(),
  3992.   observe:       Element.Methods.observe.methodize(),
  3993.   stopObserving: Element.Methods.stopObserving.methodize(),
  3994.   loaded:        false
  3995. });
  3996.  
  3997. (function() {
  3998.   /* Support for the DOMContentLoaded event is based on work by Dan Webb,
  3999.      Matthias Miller, Dean Edwards and John Resig. */
  4000.  
  4001.   var timer;
  4002.  
  4003.   function fireContentLoadedEvent() {
  4004.     if (document.loaded) return;
  4005.     if (timer) window.clearInterval(timer);
  4006.     document.fire("dom:loaded");
  4007.     document.loaded = true;
  4008.   }
  4009.  
  4010.   if (document.addEventListener) {
  4011.     if (Prototype.Browser.WebKit) {
  4012.       timer = window.setInterval(function() {
  4013.         if (/loaded|complete/.test(document.readyState))
  4014.           fireContentLoadedEvent();
  4015.       }, 0);
  4016.  
  4017.       Event.observe(window, "load", fireContentLoadedEvent);
  4018.  
  4019.     } else {
  4020.       document.addEventListener("DOMContentLoaded",
  4021.         fireContentLoadedEvent, false);
  4022.     }
  4023.  
  4024.   } else {
  4025.     document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
  4026.     $("__onDOMContentLoaded").onreadystatechange = function() {
  4027.       if (this.readyState == "complete") {
  4028.         this.onreadystatechange = null;
  4029.         fireContentLoadedEvent();
  4030.       }
  4031.     };
  4032.   }
  4033. })();
  4034. /*------------------------------- DEPRECATED -------------------------------*/
  4035.  
  4036. Hash.toQueryString = Object.toQueryString;
  4037.  
  4038. var Toggle = { display: Element.toggle };
  4039.  
  4040. Element.Methods.childOf = Element.Methods.descendantOf;
  4041.  
  4042. var Insertion = {
  4043.   Before: function(element, content) {
  4044.     return Element.insert(element, {before:content});
  4045.   },
  4046.  
  4047.   Top: function(element, content) {
  4048.     return Element.insert(element, {top:content});
  4049.   },
  4050.  
  4051.   Bottom: function(element, content) {
  4052.     return Element.insert(element, {bottom:content});
  4053.   },
  4054.  
  4055.   After: function(element, content) {
  4056.     return Element.insert(element, {after:content});
  4057.   }
  4058. };
  4059.  
  4060. var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
  4061.  
  4062. // This should be moved to script.aculo.us; notice the deprecated methods
  4063. // further below, that map to the newer Element methods.
  4064. var Position = {
  4065.   // set to true if needed, warning: firefox performance problems
  4066.   // NOT neeeded for page scrolling, only if draggable contained in
  4067.   // scrollable elements
  4068.   includeScrollOffsets: false,
  4069.  
  4070.   // must be called before calling withinIncludingScrolloffset, every time the
  4071.   // page is scrolled
  4072.   prepare: function() {
  4073.     this.deltaX =  window.pageXOffset
  4074.                 || document.documentElement.scrollLeft
  4075.                 || document.body.scrollLeft
  4076.                 || 0;
  4077.     this.deltaY =  window.pageYOffset
  4078.                 || document.documentElement.scrollTop
  4079.                 || document.body.scrollTop
  4080.                 || 0;
  4081.   },
  4082.  
  4083.   // caches x/y coordinate pair to use with overlap
  4084.   within: function(element, x, y) {
  4085.     if (this.includeScrollOffsets)
  4086.       return this.withinIncludingScrolloffsets(element, x, y);
  4087.     this.xcomp = x;
  4088.     this.ycomp = y;
  4089.     this.offset = Element.cumulativeOffset(element);
  4090.  
  4091.     return (y >= this.offset[1] &&
  4092.             y <  this.offset[1] + element.offsetHeight &&
  4093.             x >= this.offset[0] &&
  4094.             x <  this.offset[0] + element.offsetWidth);
  4095.   },
  4096.  
  4097.   withinIncludingScrolloffsets: function(element, x, y) {
  4098.     var offsetcache = Element.cumulativeScrollOffset(element);
  4099.  
  4100.     this.xcomp = x + offsetcache[0] - this.deltaX;
  4101.     this.ycomp = y + offsetcache[1] - this.deltaY;
  4102.     this.offset = Element.cumulativeOffset(element);
  4103.  
  4104.     return (this.ycomp >= this.offset[1] &&
  4105.             this.ycomp <  this.offset[1] + element.offsetHeight &&
  4106.             this.xcomp >= this.offset[0] &&
  4107.             this.xcomp <  this.offset[0] + element.offsetWidth);
  4108.   },
  4109.  
  4110.   // within must be called directly before
  4111.   overlap: function(mode, element) {
  4112.     if (!mode) return 0;
  4113.     if (mode == 'vertical')
  4114.       return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
  4115.         element.offsetHeight;
  4116.     if (mode == 'horizontal')
  4117.       return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
  4118.         element.offsetWidth;
  4119.   },
  4120.  
  4121.   // Deprecation layer -- use newer Element methods now (1.5.2).
  4122.  
  4123.   cumulativeOffset: Element.Methods.cumulativeOffset,
  4124.  
  4125.   positionedOffset: Element.Methods.positionedOffset,
  4126.  
  4127.   absolutize: function(element) {
  4128.     Position.prepare();
  4129.     return Element.absolutize(element);
  4130.   },
  4131.  
  4132.   relativize: function(element) {
  4133.     Position.prepare();
  4134.     return Element.relativize(element);
  4135.   },
  4136.  
  4137.   realOffset: Element.Methods.cumulativeScrollOffset,
  4138.  
  4139.   offsetParent: Element.Methods.getOffsetParent,
  4140.  
  4141.   page: Element.Methods.viewportOffset,
  4142.  
  4143.   clone: function(source, target, options) {
  4144.     options = options || { };
  4145.     return Element.clonePosition(target, source, options);
  4146.   }
  4147. };
  4148.  
  4149. /*--------------------------------------------------------------------------*/
  4150.  
  4151. if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
  4152.   function iter(name) {
  4153.     return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
  4154.   }
  4155.  
  4156.   instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  4157.   function(element, className) {
  4158.     className = className.toString().strip();
  4159.     var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
  4160.     return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  4161.   } : function(element, className) {
  4162.     className = className.toString().strip();
  4163.     var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
  4164.     if (!classNames && !className) return elements;
  4165.  
  4166.     var nodes = $(element).getElementsByTagName('*');
  4167.     className = ' ' + className + ' ';
  4168.  
  4169.     for (var i = 0, child, cn; child = nodes[i]; i++) {
  4170.       if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
  4171.           (classNames && classNames.all(function(name) {
  4172.             return !name.toString().blank() && cn.include(' ' + name + ' ');
  4173.           }))))
  4174.         elements.push(Element.extend(child));
  4175.     }
  4176.     return elements;
  4177.   };
  4178.  
  4179.   return function(className, parentElement) {
  4180.     return $(parentElement || document.body).getElementsByClassName(className);
  4181.   };
  4182. }(Element.Methods);
  4183.  
  4184. /*--------------------------------------------------------------------------*/
  4185.  
  4186. Element.ClassNames = Class.create();
  4187. Element.ClassNames.prototype = {
  4188.   initialize: function(element) {
  4189.     this.element = $(element);
  4190.   },
  4191.  
  4192.   _each: function(iterator) {
  4193.     this.element.className.split(/\s+/).select(function(name) {
  4194.       return name.length > 0;
  4195.     })._each(iterator);
  4196.   },
  4197.  
  4198.   set: function(className) {
  4199.     this.element.className = className;
  4200.   },
  4201.  
  4202.   add: function(classNameToAdd) {
  4203.     if (this.include(classNameToAdd)) return;
  4204.     this.set($A(this).concat(classNameToAdd).join(' '));
  4205.   },
  4206.  
  4207.   remove: function(classNameToRemove) {
  4208.     if (!this.include(classNameToRemove)) return;
  4209.     this.set($A(this).without(classNameToRemove).join(' '));
  4210.   },
  4211.  
  4212.   toString: function() {
  4213.     return $A(this).join(' ');
  4214.   }
  4215. };
  4216.  
  4217. Object.extend(Element.ClassNames.prototype, Enumerable);
  4218.  
  4219. /*--------------------------------------------------------------------------*/
  4220.  
  4221. Element.addMethods();

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