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再来看protype.js文件.

/* Prototype JavaScript framework, version 1.5.0
* (c) 2005-2007 Sam Stephenson
*
* Prototype is freely distributable under the terms of an MIT-style license.
* For details, see the Prototype web site: http://prototype.conio.net/
*
/*--------------------------------------------------------------------------*/

var Prototype = {
Version: '1.5.0',
BrowserFeatures: {
XPath: !!document.evaluate
},

ScriptFragment: '(?:)((\n|\r|.)*?)(?:)',
emptyFunction: function() {},
K: function(x) { return x }
}

var Class = {
create: function() {
    return function() {
      this.initialize.apply(this, arguments);
    }
}
}

var Abstract = new Object();

Object.extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}

Object.extend(Object, {
inspect: function(object) {
    try {
      if (object === undefined) return 'undefined';
      if (object === null) return 'null';
      return object.inspect ? object.inspect() : object.toString();
    } catch (e) {
      if (e instanceof RangeError) return '...';
      throw e;
    }
},

keys: function(object) {
    var keys = [];
    for (var property in object)
      keys.push(property);
    return keys;
},

values: function(object) {
    var values = [];
    for (var property in object)
      values.push(object[property]);
    return values;
},

clone: function(object) {
return Object.extend({}, object);
}
});

Function.prototype.bind = function() {
var __method = this, args = $A(arguments), object = args.shift();
return function() {
return __method.apply(object, args.concat($A(arguments)));
}
}

Function.prototype.bindAsEventListener = function(object) {
var __method = this, args = $A(arguments), object = args.shift();
return function(event) {
return __method.apply(object, [( event || window.event)].concat(args).concat($A(arguments)));
}
}

Object.extend(Number.prototype, {
toColorPart: function() {
var digits = this.toString(16);
if (this return digits;
},

succ: function() {
return this + 1;
},

times: function(iterator) {
$R(0, this, true).each(iterator);
return this;
}
});

var Try = {
these: function() {
var returnValue;

    for (var i = 0, length = arguments.length; i       var lambda = arguments[i];
      try {
        returnValue = lambda();
        break;
      } catch (e) {}
    }

return returnValue;
}
}

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
initialize: function(callback, frequency) {
    this.callback = callback;
    this.frequency = frequency;
    this.currentlyExecuting = false;

this.registerCallback();
},

registerCallback: function() {
this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},

stop: function() {
    if (!this.timer) return;
    clearInterval(this.timer);
    this.timer = null;
},

onTimerEvent: function() {
    if (!this.currentlyExecuting) {
      try {
        this.currentlyExecuting = true;
        this.callback(this);
      } finally {
        this.currentlyExecuting = false;
      }
    }
}
}
String.interpret = function(value){
return value == null ? '' : String(value);
}

Object.extend(String.prototype, {
gsub: function(pattern, replacement) {
var result = '', source = this, match;
replacement = arguments.callee.prepareReplacement(replacement);

    while (source.length > 0) {
      if (match = source.match(pattern)) {
        result += source.slice(0, match.index);
        result += String.interpret(replacement(match));
        source = source.slice(match.index + match[0].length);
      } else {
        result += source, source = '';
      }
    }
    return result;
},

sub: function(pattern, replacement, count) {
replacement = this.gsub.prepareReplacement(replacement);
count = count === undefined ? 1 : count;

    return this.gsub(pattern, function(match) {
      if (--count       return replacement(match);
    });
},

scan: function(pattern, iterator) {
this.gsub(pattern, iterator);
return this;
},

truncate: function(length, truncation) {
    length = length || 30;
    truncation = truncation === undefined ? '...' : truncation;
    return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : this;
},

strip: function() {
return this.replace(/^\s+/, '').replace(/\s+$/, '');
},

stripTags: function() {
return this.replace(/]+>/gi, '');
},

stripScripts: function() {
return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
},

extractScripts: function() {
    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
    return (this.match(matchAll) || []).map(function(scriptTag) {
      return (scriptTag.match(matchOne) || ['', ''])[1];
    });
},

evalScripts: function() {
return this.extractScripts().map(function(script) { return eval(script) });
},

escapeHTML: function() {
    var div = document.createElement('div');
    var text = document.createTextNode(this);
    div.appendChild(text);
    return div.innerHTML;
},

unescapeHTML: function() {
    var div = document.createElement('div');
    div.innerHTML = this.stripTags();
    return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('',function(memo,node){ return memo+node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
},

toQueryParams: function(separator) {
var match = this.strip().match(/([^?#]*)(#.*)?$/);
if (!match) return {};

    return match[1].split(separator || '&').inject({}, function(hash, pair) {
      if ((pair = pair.split('='))[0]) {
        var name = decodeURIComponent(pair[0]);
        var value = pair[1] ? decodeURIComponent(pair[1]) : undefined;

        if (hash[name] !== undefined) {
          if (hash[name].constructor != Array)
            hash[name] = [hash[name]];
          if (value) hash[name].push(value);
        }
        else hash[name] = value;
      }
      return hash;
    });
},

toArray: function() {
return this.split('');
},

succ: function() {
return this.slice(0, this.length - 1) +
String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
},

camelize: function() {
var parts = this.split('-'), len = parts.length;
if (len == 1) return parts[0];

    var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

for (var i = 1; i camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

return camelized;
},

capitalize: function(){
return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
},

underscore: function() {
return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
},

dasherize: function() {
return this.gsub(/_/,'-');
},

inspect: function(useDoubleQuotes) {
    var escapedString = this.replace(/\\/g, '\\\\');
    if (useDoubleQuotes)
      return '"' + escapedString.replace(/"/g, '\\"') + '"';
    else
      return "'" + escapedString.replace(/'/g, '\\\'') + "'";
}
});

String.prototype.gsub.prepareReplacement = function(replacement) {
if (typeof replacement == 'function') return replacement;
var template = new Template(replacement);
return function(match) { return template.evaluate(match) };
}

String.prototype.parseQuery = String.prototype.toQueryParams;

var Template = Class.create();
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
Template.prototype = {
initialize: function(template, pattern) {
this.template = template.toString();
this.pattern = pattern || Template.Pattern;
},

evaluate: function(object) {
    return this.template.gsub(this.pattern, function(match) {
      var before = match[1];
      if (before == '\\') return match[2];
      return before + String.interpret(object[match[3]]);
    });
}
}

var $break = new Object();
var $continue = new Object();

eachSlice: function(number, iterator) {
    var index = -number, slices = [], array = this.toArray();
    while ((index += number)       slices.push(array.slice(index, index+number));
    return slices.map(iterator);
},

all: function(iterator) {
    var result = true;
    this.each(function(value, index) {
      result = result && !!(iterator || Prototype.K)(value, index);
      if (!result) throw $break;
    });
    return result;
},

any: function(iterator) {
    var result = false;
    this.each(function(value, index) {
      if (result = !!(iterator || Prototype.K)(value, index))
        throw $break;
    });
    return result;
},

collect: function(iterator) {
    var results = [];
    this.each(function(value, index) {
      results.push((iterator || Prototype.K)(value, index));
    });
    return results;
},

detect: function(iterator) {
    var result;
    this.each(function(value, index) {
      if (iterator(value, index)) {
        result = value;
        throw $break;
      }
    });
    return result;
},

findAll: function(iterator) {
    var results = [];
    this.each(function(value, index) {
      if (iterator(value, index))
        results.push(value);
    });
    return results;
},

grep: function(pattern, iterator) {
    var results = [];
    this.each(function(value, index) {
      var stringValue = value.toString();
      if (stringValue.match(pattern))
        results.push((iterator || Prototype.K)(value, index));
    })
    return results;
},

include: function(object) {
    var found = false;
    this.each(function(value) {
      if (value == object) {
        found = true;
        throw $break;
      }
    });
    return found;
},

inGroupsOf: function(number, fillWith) {
    fillWith = fillWith === undefined ? null : fillWith;
    return this.eachSlice(number, function(slice) {
      while(slice.length       return slice;
    });
},

inject: function(memo, iterator) {
    this.each(function(value, index) {
      memo = iterator(memo, value, index);
    });
    return memo;
},

invoke: function(method) {
    var args = $A(arguments).slice(1);
    return this.map(function(value) {
      return value[method].apply(value, args);
    });
},

max: function(iterator) {
    var result;
    this.each(function(value, index) {
      value = (iterator || Prototype.K)(value, index);
      if (result == undefined || value >= result)
        result = value;
    });
    return result;
},

min: function(iterator) {
    var result;
    this.each(function(value, index) {
      value = (iterator || Prototype.K)(value, index);
      if (result == undefined || value         result = value;
    });
    return result;
},

partition: function(iterator) {
    var trues = [], falses = [];
    this.each(function(value, index) {
      ((iterator || Prototype.K)(value, index) ?
        trues : falses).push(value);
    });
    return [trues, falses];
},

pluck: function(property) {
    var results = [];
    this.each(function(value, index) {
      results.push(value[property]);
    });
    return results;
},

reject: function(iterator) {
    var results = [];
    this.each(function(value, index) {
      if (!iterator(value, index))
        results.push(value);
    });
    return results;
},

sortBy: function(iterator) {
    return this.map(function(value, index) {
      return {value: value, criteria: iterator(value, index)};
    }).sort(function(left, right) {
      var a = left.criteria, b = right.criteria;
      return a b ? 1 : 0;
    }).pluck('value');
},

toArray: function() {
return this.map();
},

zip: function() {
    var iterator = Prototype.K, args = $A(arguments);
    if (typeof args.last() == 'function')
      iterator = args.pop();

    var collections = [this].concat(args).map($A);
    return this.map(function(value, index) {
      return iterator(collections.pluck(index));
    });
},

size: function() {
return this.toArray().length;
},

inspect: function() {
return '#';
}
}

Object.extend(Enumerable, {
map:     Enumerable.collect,
find:    Enumerable.detect,
select: Enumerable.findAll,
member: Enumerable.include,
entries: Enumerable.toArray
});
var $A = Array.from = function(iterable) {
if (!iterable) return [];
if (iterable.toArray) {
    return iterable.toArray();
} else {
    var results = [];
    for (var i = 0, length = iterable.length; i       results.push(iterable[i]);
    return results;
}
}

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse)
Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
_each: function(iterator) {
for (var i = 0, length = this.length; i iterator(this[i]);
},

clear: function() {
this.length = 0;
return this;
},

first: function() {
return this[0];
},

last: function() {
return this[this.length - 1];
},

compact: function() {
    return this.select(function(value) {
      return value != null;
    });
},

flatten: function() {
    return this.inject([], function(array, value) {
      return array.concat(value && value.constructor == Array ?
        value.flatten() : [value]);
    });
},

without: function() {
    var values = $A(arguments);
    return this.select(function(value) {
      return !values.include(value);
    });
},

indexOf: function(object) {
for (var i = 0, length = this.length; i if (this[i] == object) return i;
return -1;
},

reverse: function(inline) {
return (inline !== false ? this : this.toArray())._reverse();
},

reduce: function() {
return this.length > 1 ? this : this[0];
},

uniq: function() {
    return this.inject([], function(array, value) {
      return array.include(value) ? array : array.concat([value]);
    });
},

clone: function() {
return [].concat(this);
},

size: function() {
return this.length;
},

inspect: function() {
return '[' + this.map(Object.inspect).join(', ') + ']';
}
});

Array.prototype.toArray = Array.prototype.clone;

function $w(string){
string = string.strip();
return string ? string.split(/\s+/) : [];
}

if(window.opera){
Array.prototype.concat = function(){
    var array = [];
    for(var i = 0, length = this.length; i     for(var i = 0, length = arguments.length; i       if(arguments[i].constructor == Array) {
        for(var j = 0, arrayLength = arguments[i].length; j           array.push(arguments[i][j]);
      } else {
        array.push(arguments[i]);
      }
    }
    return array;
}
}
var Hash = function(obj) {
Object.extend(this, obj || {});
};

Object.extend(Hash, {
toQueryString: function(obj) {
var parts = [];

this.prototype._each.call(obj, function(pair) {
if (!pair.key) return;

      if (pair.value && pair.value.constructor == Array) {
        var values = pair.value.compact();
        if (values.length         else {
        key = encodeURIComponent(pair.key);
          values.each(function(value) {
            value = value != undefined ? encodeURIComponent(value) : '';
            parts.push(key + '=' + encodeURIComponent(value));
          });
          return;
        }
      }
      if (pair.value == undefined) pair[1] = '';
      parts.push(pair.map(encodeURIComponent).join('='));
   });

return parts.join('&');
}
});

Object.extend(Hash.prototype, Enumerable);
Object.extend(Hash.prototype, {
_each: function(iterator) {
    for (var key in this) {
      var value = this[key];
      if (value && value == Hash.prototype[key]) continue;

      var pair = [key, value];
      pair.key = key;
      pair.value = value;
      iterator(pair);
    }
},

keys: function() {
return this.pluck('key');
},

values: function() {
return this.pluck('value');
},

merge: function(hash) {
    return $H(hash).inject(this, function(mergedHash, pair) {
      mergedHash[pair.key] = pair.value;
      return mergedHash;
    });
},

remove: function() {
    var result;
    for(var i = 0, length = arguments.length; i       var value = this[arguments[i]];
      if (value !== undefined){
        if (result === undefined) result = value;
        else {
          if (result.constructor != Array) result = [result];
          result.push(value)
        }
      }
      delete this[arguments[i]];
    }
    return result;
},

toQueryString: function() {
return Hash.toQueryString(this);
},

inspect: function() {
return '# return pair.map(Object.inspect).join(': ');
}).join(', ') + '}>';
}
});

function $H(object) {
if (object && object.constructor == Hash) return object;
return new Hash(object);
};
ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
initialize: function(start, end, exclusive) {
    this.start = start;
    this.end = end;
    this.exclusive = exclusive;
},

_each: function(iterator) {
    var value = this.start;
    while (this.include(value)) {
      iterator(value);
      value = value.succ();
    }
},

include: function(value) {
    if (value       return false;
    if (this.exclusive)
      return value     return value }
});

var $R = function(start, end, exclusive) {
return new ObjectRange(start, end, exclusive);
}

var Ajax = {
getTransport: function() {
    return Try.these(
      function() {return new XMLHttpRequest()},
      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
    ) || false;
},

activeRequestCount: 0
}

Ajax.Responders = {
responders: [],

_each: function(iterator) {
this.responders._each(iterator);
},

unregister: function(responder) {
this.responders = this.responders.without(responder);
},

dispatch: function(callback, request, transport, json) {
    this.each(function(responder) {
      if (typeof responder[callback] == 'function') {
        try {
          responder[callback].apply(responder, [request, transport, json]);
        } catch (e) {}
      }
    });
}
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
onCreate: function() {
Ajax.activeRequestCount++;
},
onComplete: function() {
Ajax.activeRequestCount--;
}
});

Ajax.Base = function() {};
Ajax.Base.prototype = {
setOptions: function(options) {
    this.options = {
      method:       'post',
      asynchronous: true,
      contentType: 'application/x-www-form-urlencoded',
      encoding:     'UTF-8',
      parameters:   ''
    }
    Object.extend(this.options, options || {});

    this.options.method = this.options.method.toLowerCase();
    if (typeof this.options.parameters == 'string')
      this.options.parameters = this.options.parameters.toQueryParams();
}
}

Ajax.Request = Class.create();
Ajax.Request.Events =
['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
_complete: false,

initialize: function(url, options) {
    this.transport = Ajax.getTransport();
    this.setOptions(options);
    this.request(url);
},

request: function(url) {
    this.url = url;
    this.method = this.options.method;
    var params = this.options.parameters;

    if (!['get', 'post'].include(this.method)) {
      // simulate other verbs over post
      params['_method'] = this.method;
      this.method = 'post';
    }

params = Hash.toQueryString(params);
if (params && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) params += '&_='

    // when GET, append parameters to URL
    if (this.method == 'get' && params)
      this.url += (this.url.indexOf('?') > -1 ? '&' : '?') + params;

try {
Ajax.Responders.dispatch('onCreate', this, this.transport);

this.transport.open(this.method.toUpperCase(), this.url,
this.options.asynchronous);

if (this.options.asynchronous)
setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);

this.transport.onreadystatechange = this.onStateChange.bind(this);
this.setRequestHeaders();

var body = this.method == 'post' ? (this.options.postBody || params) : null;

this.transport.send(body);

      /* Force Firefox to handle ready state 4 for synchronous requests */
      if (!this.options.asynchronous && this.transport.overrideMimeType)
        this.onStateChange();

    }
    catch (e) {
      this.dispatchException(e);
    }
},

onStateChange: function() {
    var readyState = this.transport.readyState;
    if (readyState > 1 && !((readyState == 4) && this._complete))
      this.respondToReadyState(this.transport.readyState);
},

setRequestHeaders: function() {
    var headers = {
      'X-Requested-With': 'XMLHttpRequest',
      'X-Prototype-Version': Prototype.Version,
      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
    };

    if (this.method == 'post') {
      headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

      /* Force "Connection: close" for older Mozilla browsers to work
       * around a bug where XMLHttpRequest sends an incorrect
       * Content-length header. See Mozilla Bugzilla #246651.
       */
      if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1]             headers['Connection'] = 'close';
    }

    // user-defined headers
    if (typeof this.options.requestHeaders == 'object') {
      var extras = this.options.requestHeaders;

      if (typeof extras.push == 'function')
        for (var i = 0, length = extras.length; i           headers[extras[i]] = extras[i+1];
      else
        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
    }

for (var name in headers)
this.transport.setRequestHeader(name, headers[name]);
},

success: function() {
return !this.transport.status
|| (this.transport.status >= 200 && this.transport.status },

respondToReadyState: function(readyState) {
var state = Ajax.Request.Events[readyState];
var transport = this.transport, json = this.evalJSON();

    if (state == 'Complete') {
      try {
        this._complete = true;
        (this.options['on' + this.transport.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(transport, json);
      } catch (e) {
        this.dispatchException(e);
      }

      if ((this.getHeader('Content-type') || 'text/javascript').strip().
        match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
          this.evalResponse();
    }

    try {
      (this.options['on' + state] || Prototype.emptyFunction)(transport, json);
      Ajax.Responders.dispatch('on' + state, this, transport, json);
    } catch (e) {
      this.dispatchException(e);
    }

    if (state == 'Complete') {
      // avoid memory leak in MSIE: clean up
      this.transport.onreadystatechange = Prototype.emptyFunction;
    }
},

getHeader: function(name) {
    try {
      return this.transport.getResponseHeader(name);
    } catch (e) { return null }
},

evalJSON: function() {
    try {
      var json = this.getHeader('X-JSON');
      return json ? eval('(' + json + ')') : null;
    } catch (e) { return null }
},

evalResponse: function() {
    try {
      return eval(this.transport.responseText);
    } catch (e) {
      this.dispatchException(e);
    }
},

dispatchException: function(exception) {
(this.options.onException || Prototype.emptyFunction)(this, exception);
Ajax.Responders.dispatch('onException', this, exception);
}
});

Ajax.Updater = Class.create();

Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
initialize: function(container, url, options) {
    this.container = {
      success: (container.success || container),
      failure: (container.failure || (container.success ? null : container))
    }

this.transport = Ajax.getTransport();
this.setOptions(options);

    var onComplete = this.options.onComplete || Prototype.emptyFunction;
    this.options.onComplete = (function(transport, param) {
      this.updateContent();
      onComplete(transport, param);
    }).bind(this);

this.request(url);
},

updateContent: function() {
var receiver = this.container[this.success() ? 'success' : 'failure'];
var response = this.transport.responseText;

if (!this.options.evalScripts) response = response.stripScripts();

    if (receiver = $(receiver)) {
      if (this.options.insertion)
        new this.options.insertion(receiver, response);
      else
        receiver.update(response);
    }

    if (this.success()) {
      if (this.onComplete)
        setTimeout(this.onComplete.bind(this), 10);
    }
}
});

Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
initialize: function(container, url, options) {
this.setOptions(options);
this.onComplete = this.options.onComplete;

this.frequency = (this.options.frequency || 2);
this.decay = (this.options.decay || 1);

    this.updater = {};
    this.container = container;
    this.url = url;

this.start();
},

start: function() {
this.options.onComplete = this.updateComplete.bind(this);
this.onTimerEvent();
},

stop: function() {
    this.updater.options.onComplete = undefined;
    clearTimeout(this.timer);
    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
},

updateComplete: function(request) {
    if (this.options.decay) {
      this.decay = (request.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

      this.lastText = request.responseText;
    }
    this.timer = setTimeout(this.onTimerEvent.bind(this),
      this.decay * this.frequency * 1000);
},

onTimerEvent: function() {
    this.updater = new Ajax.Updater(this.container, this.url, this.options);
}
});
function $(element) {
if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i       elements.push($(arguments[i]));
    return elements;
}
if (typeof element == 'string')
    element = document.getElementById(element);
return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
document._getElementsByXPath = function(expression, parentElement) {
    var results = [];
    var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = 0, length = query.snapshotLength; i       results.push(query.snapshotItem(i));
    return results;
};
}

/*--------------------------------------------------------------------------*/

if (!window.Element)
var Element = new Object();

Element.extend = function(element) {
if (!element || _nativeExtensions || element.nodeType == 3) return element;

if (!element._extended && element.tagName && element != window) {
var methods = Object.clone(Element.Methods), cache = Element.extend.cache;

    if (element.tagName == 'FORM')
      Object.extend(methods, Form.Methods);
    if (['INPUT', 'TEXTAREA', 'SELECT'].include(element.tagName))
      Object.extend(methods, Form.Element.Methods);

Object.extend(methods, Element.Methods.Simulated);

    for (var property in methods) {
      var value = methods[property];
      if (typeof value == 'function' && !(property in element))
        element[property] = cache.findOrStore(value);
    }
}

element._extended = true;
return element;
};

Element.extend.cache = {
findOrStore: function(value) {
    return this[value] = this[value] || function() {
      return value.apply(null, [this].concat($A(arguments)));
    }
}
};

Element.Methods = {
visible: function(element) {
return $(element).style.display != 'none';
},

toggle: function(element) {
    element = $(element);
    Element[Element.visible(element) ? 'hide' : 'show'](element);
    return element;
},

hide: function(element) {
$(element).style.display = 'none';
return element;
},

show: function(element) {
$(element).style.display = '';
return element;
},

remove: function(element) {
    element = $(element);
    element.parentNode.removeChild(element);
    return element;
},

update: function(element, html) {
    html = typeof html == 'undefined' ? '' : html.toString();
    $(element).innerHTML = html.stripScripts();
    setTimeout(function() {html.evalScripts()}, 10);
    return element;
},

replace: function(element, html) {
    element = $(element);
    html = typeof html == 'undefined' ? '' : html.toString();
    if (element.outerHTML) {
      element.outerHTML = html.stripScripts();
    } else {
      var range = element.ownerDocument.createRange();
      range.selectNodeContents(element);
      element.parentNode.replaceChild(
        range.createContextualFragment(html.stripScripts()), element);
    }
    setTimeout(function() {html.evalScripts()}, 10);
    return element;
},

inspect: function(element) {
    element = $(element);
    var result = '     $H({'id': 'id', 'className': 'class'}).each(function(pair) {
      var property = pair.first(), attribute = pair.last();
      var value = (element[property] || '').toString();
      if (value) result += ' ' + attribute + '=' + value.inspect(true);
    });
    return result + '>';
},

recursivelyCollect: function(element, property) {
    element = $(element);
    var elements = [];
    while (element = element[property])
      if (element.nodeType == 1)
        elements.push(Element.extend(element));
    return elements;
},

ancestors: function(element) {
return $(element).recursivelyCollect('parentNode');
},

descendants: function(element) {
return $A($(element).getElementsByTagName('*'));
},

immediateDescendants: function(element) {
    if (!(element = $(element).firstChild)) return [];
    while (element && element.nodeType != 1) element = element.nextSibling;
    if (element) return [element].concat($(element).nextSiblings());
    return [];
},

previousSiblings: function(element) {
return $(element).recursivelyCollect('previousSibling');
},

nextSiblings: function(element) {
return $(element).recursivelyCollect('nextSibling');
},

siblings: function(element) {
element = $(element);
return element.previousSiblings().reverse().concat(element.nextSiblings());
},

match: function(element, selector) {
    if (typeof selector == 'string')
      selector = new Selector(selector);
    return selector.match($(element));
},

up: function(element, expression, index) {
return Selector.findElement($(element).ancestors(), expression, index);
},

down: function(element, expression, index) {
return Selector.findElement($(element).descendants(), expression, index);
},

previous: function(element, expression, index) {
return Selector.findElement($(element).previousSiblings(), expression, index);
},

next: function(element, expression, index) {
return Selector.findElement($(element).nextSiblings(), expression, index);
},

getElementsBySelector: function() {
var args = $A(arguments), element = $(args.shift());
return Selector.findChildElements(element, args);
},

getElementsByClassName: function(element, className) {
return document.getElementsByClassName(className, element);
},

readAttribute: function(element, name) {
    element = $(element);
    if (document.all && !window.opera) {
      var t = Element._attributeTranslations;
      if (t.values[name]) return t.values[name](element, name);
      if (t.names[name]) name = t.names[name];
      var attribute = element.attributes[name];
      if(attribute) return attribute.nodeValue;
    }
    return element.getAttribute(name);
},

getHeight: function(element) {
return $(element).getDimensions().height;
},

getWidth: function(element) {
return $(element).getDimensions().width;
},

classNames: function(element) {
return new Element.ClassNames(element);
},

hasClassName: function(element, className) {
    if (!(element = $(element))) return;
    var elementClassName = element.className;
    if (elementClassName.length == 0) return false;
    if (elementClassName == className ||
        elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
      return true;
    return false;
},

addClassName: function(element, className) {
    if (!(element = $(element))) return;
    Element.classNames(element).add(className);
    return element;
},

removeClassName: function(element, className) {
    if (!(element = $(element))) return;
    Element.classNames(element).remove(className);
    return element;
},

toggleClassName: function(element, className) {
    if (!(element = $(element))) return;
    Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
    return element;
},

observe: function() {
Event.observe.apply(Event, arguments);
return $A(arguments).first();
},

stopObserving: function() {
Event.stopObserving.apply(Event, arguments);
return $A(arguments).first();
},

// removes whitespace-only text node children
cleanWhitespace: function(element) {
    element = $(element);
    var node = element.firstChild;
    while (node) {
      var nextNode = node.nextSibling;
      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
        element.removeChild(node);
      node = nextNode;
    }
    return element;
},

empty: function(element) {
return $(element).innerHTML.match(/^\s*$/);
},

descendantOf: function(element, ancestor) {
    element = $(element), ancestor = $(ancestor);
    while (element = element.parentNode)
      if (element == ancestor) return true;
    return false;
},

scrollTo: function(element) {
    element = $(element);
    var pos = Position.cumulativeOffset(element);
    window.scrollTo(pos[0], pos[1]);
    return element;
},

getStyle: function(element, style) {
    element = $(element);
    if (['float','cssFloat'].include(style))
      style = (typeof element.style.styleFloat != 'undefined' ? 'styleFloat' : 'cssFloat');
    style = style.camelize();
    var value = element.style[style];
    if (!value) {
      if (document.defaultView && document.defaultView.getComputedStyle) {
        var css = document.defaultView.getComputedStyle(element, null);
        value = css ? css[style] : null;
      } else if (element.currentStyle) {
        value = element.currentStyle[style];
      }
    }

if((value == 'auto') && ['width','height'].include(style) && (element.getStyle('display') != 'none'))
value = element['offset'+style.capitalize()] + 'px';

    if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
      if (Element.getStyle(element, 'position') == 'static') value = 'auto';
    if(style == 'opacity') {
      if(value) return parseFloat(value);
      if(value = (element.getStyle('filter') || '').match(/alpha$opacity=(.*)$/))
        if(value[1]) return parseFloat(value[1]) / 100;
      return 1.0;
    }
    return value == 'auto' ? null : value;
},

setStyle: function(element, style) {
    element = $(element);
    for (var name in style) {
      var value = style[name];
      if(name == 'opacity') {
        if (value == 1) {
          value = (/Gecko/.test(navigator.userAgent) &&
            !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;
          if(/MSIE/.test(navigator.userAgent) && !window.opera)
            element.style.filter = element.getStyle('filter').replace(/alpha$[^$]*\)/gi,'');
        } else if(value === '') {
          if(/MSIE/.test(navigator.userAgent) && !window.opera)
            element.style.filter = element.getStyle('filter').replace(/alpha$[^$]*\)/gi,'');
        } else {
          if(value           if(/MSIE/.test(navigator.userAgent) && !window.opera)
            element.style.filter = element.getStyle('filter').replace(/alpha$[^$]*\)/gi,'') +
              'alpha(opacity='+value*100+')';
        }
      } else if(['float','cssFloat'].include(name)) name = (typeof element.style.styleFloat != 'undefined') ? 'styleFloat' : 'cssFloat';
      element.style[name.camelize()] = value;
    }
    return element;
},

getDimensions: function(element) {
    element = $(element);
    var display = $(element).getStyle('display');
    if (display != 'none' && display != null) // Safari bug
      return {width: element.offsetWidth, height: element.offsetHeight};

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    var originalDisplay = els.display;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = 'block';
    var originalWidth = element.clientWidth;
    var originalHeight = element.clientHeight;
    els.display = originalDisplay;
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return {width: originalWidth, height: originalHeight};
},

makePositioned: function(element) {
    element = $(element);
    var pos = Element.getStyle(element, 'position');
    if (pos == 'static' || !pos) {
      element._madePositioned = true;
&nbs