/*  Prototype JavaScript framework, version 1.4.0
 *  (c) 2005 Sam Stephenson <sam@conio.net>
 *
 *  THIS FILE IS AUTOMATICALLY GENERATED. When sending patches, please diff
 *  against the source tree, available from the Prototype darcs repository.
 *
 *  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: '1.4.0',
ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',

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 (property in source) {
destination[property] = source[property];
}
return destination;
}

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;
}
}

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;
return function(event) {
return __method.call(object, event || window.event);
}
}

Object.extend(Number.prototype, {
toColorPart: function() {
var digits = this.toString(16);
if (this < 16) return '0' + digits;
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; i < 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() {
setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},

onTimerEvent: function() {
if (!this.currentlyExecuting) {
  try {
    this.currentlyExecuting = true;
    this.callback();
  } finally {
    this.currentlyExecuting = false;
  }
}
}
}

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

function $() {
var elements = new Array();

for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
  element = document.getElementById(element);

if (arguments.length == 1)
  return element;

elements.push(element);
}

return elements;
}
Object.extend(String.prototype, {
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(eval);
},

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[0].nodeValue : '';
},

toQueryParams: function() {
var pairs = this.match(/^\??(.*)$/)[1].split('&');
return pairs.inject({}, function(params, pairString) {
  var pair = pairString.split('=');
  params[pair[0]] = pair[1];
  return params;
});
},

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

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

var camelizedString = this.indexOf('-') == 0
  ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
  : oStringList[0];

for (var i = 1, len = oStringList.length; i < len; i++) {
  var s = oStringList[i];
  camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
}

return camelizedString;
},

inspect: function() {
return "'" + this.replace('\\', '\\\\').replace("'", '\\\'') + "'";
}
});

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

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

var Enumerable = {
each: function(iterator) {
var index = 0;
try {
  this._each(function(value) {
    try {
      iterator(value, index++);
    } catch (e) {
      if (e != $continue) throw e;
    }
  });
} catch (e) {
  if (e != $break) throw e;
}
},

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 = true;
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(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;
},

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.collect(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 (value >= (result || value))
    result = value;
});
return result;
},

min: function(iterator) {
var result;
this.each(function(value, index) {
  value = (iterator || Prototype.K)(value, index);
  if (value <= (result || 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.collect(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 : a > b ? 1 : 0;
}).pluck('value');
},

toArray: function() {
return this.collect(Prototype.K);
},

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) {
  iterator(value = collections.pluck(index));
  return value;
});
},

inspect: function() {
return '#<Enumerable:' + this.toArray().inspect() + '>';
}
}

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; i < iterable.length; i++)
  results.push(iterable[i]);
return results;
}
}

Object.extend(Array.prototype, Enumerable);

Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
_each: function(iterator) {
for (var i = 0; i < 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 != undefined || value != null;
});
},

flatten: function() {
return this.inject([], function(array, value) {
  return array.concat(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; i < this.length; i++)
  if (this[i] == object) return i;
return -1;
},

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

shift: function() {
var result = this[0];
for (var i = 0; i < this.length - 1; i++)
  this[i] = this[i + 1];
this.length--;
return result;
},

inspect: function() {
return '[' + this.map(Object.inspect).join(', ') + ']';
}
});
var Hash = {
_each: function(iterator) {
for (key in this) {
  var value = this[key];
  if (typeof value == 'function') 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 $H(hash).inject($H(this), function(mergedHash, pair) {
  mergedHash[pair.key] = pair.value;
  return mergedHash;
});
},

toQueryString: function() {
return this.map(function(pair) {
  return pair.map(encodeURIComponent).join('=');
}).join('&');
},

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

function $H(object) {
var hash = Object.extend({}, object || {});
Object.extend(hash, Enumerable);
Object.extend(hash, Hash);
return hash;
}
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;
do {
  iterator(value);
  value = value.succ();
} while (this.include(value));
},

include: function(value) {
if (value < this.start)
  return false;
if (this.exclusive)
  return value < this.end;
return value <= this.end;
}
});

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

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

activeRequestCount: 0
}

Ajax.Responders = {
responders: [],

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

register: function(responderToAdd) {
if (!this.include(responderToAdd))
  this.responders.push(responderToAdd);
},

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

dispatch: function(callback, request, transport, json) {
this.each(function(responder) {
  if (responder[callback] && 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,
  parameters:   ''
}
Object.extend(this.options, options || {});
},

responseIsSuccess: function() {
return this.transport.status == undefined
    || this.transport.status == 0
    || (this.transport.status >= 200 && this.transport.status < 300);
},

responseIsFailure: function() {
return !this.responseIsSuccess();
}
}

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

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
initialize: function(url, options) {
this.transport = Ajax.getTransport();
this.setOptions(options);
this.request(url);
},

request: function(url) {
var parameters = this.options.parameters || '';
if (parameters.length > 0) parameters += '&_=';

try {
  this.url = url;
  if (this.options.method == 'get' && parameters.length > 0)
    this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;

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

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

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

  this.setRequestHeaders();

  var body = this.options.postBody ? this.options.postBody : parameters;
  this.transport.send(this.options.method == 'post' ? body : null);

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

setRequestHeaders: function() {
var requestHeaders =
  ['X-Requested-With', 'XMLHttpRequest',
   'X-Prototype-Version', Prototype.Version];

if (this.options.method == 'post') {
  requestHeaders.push('Content-type',
    'application/x-www-form-urlencoded');

  /* Force "Connection: close" for Mozilla browsers to work around
   * a bug where XMLHttpReqeuest sends an incorrect Content-length
   * header. See Mozilla Bugzilla #246651.
   */
  if (this.transport.overrideMimeType)
    requestHeaders.push('Connection', 'close');
}

if (this.options.requestHeaders)
  requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);

for (var i = 0; i < requestHeaders.length; i += 2)
  this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
},

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

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

evalJSON: function() {
try {
  return eval(this.header('X-JSON'));
} catch (e) {}
},

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

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

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

  if ((this.header('Content-type') || '').match(/^text\/javascript/i))
    this.evalResponse();
}

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

/* Avoid memory leak in MSIE: clean up the oncomplete event handler */
if (event == 'Complete')
  this.transport.onreadystatechange = Prototype.emptyFunction;
},

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.containers = {
  success: container.success ? $(container.success) : $(container),
  failure: 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, object) {
  this.updateContent();
  onComplete(transport, object);
}).bind(this);

this.request(url);
},

updateContent: function() {
var receiver = this.responseIsSuccess() ?
  this.containers.success : this.containers.failure;
var response = this.transport.responseText;

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

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

if (this.responseIsSuccess()) {
  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.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);
}
});
document.getElementsByClassName = function(className, parentElement) {
var children = ($(parentElement) || document.body).getElementsByTagName('*');
return $A(children).inject([], function(elements, child) {
if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
  elements.push(child);
return elements;
});
}

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

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

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

toggle: function() {
for (var i = 0; i < arguments.length; i++) {
  var element = $(arguments[i]);
  Element[Element.visible(element) ? 'hide' : 'show'](element);
}
},

hide: function() {
for (var i = 0; i < arguments.length; i++) {
  var element = $(arguments[i]);
  element.style.display = 'none';
}
},

show: function() {
for (var i = 0; i < arguments.length; i++) {
  var element = $(arguments[i]);
  element.style.display = '';
}
},

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

update: function(element, html) {
$(element).innerHTML = html.stripScripts();
setTimeout(function() {html.evalScripts()}, 10);
},

getHeight: function(element) {
element = $(element);
return element.offsetHeight;
},

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

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

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

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

// removes whitespace-only text node children
cleanWhitespace: function(element) {
element = $(element);
for (var i = 0; i < element.childNodes.length; i++) {
  var node = element.childNodes[i];
  if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
    Element.remove(node);
}
},

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

scrollTo: function(element) {
element = $(element);
var x = element.x ? element.x : element.offsetLeft,
    y = element.y ? element.y : element.offsetTop;
window.scrollTo(x, y);
},

getStyle: function(element, style) {
element = $(element);
var value = element.style[style.camelize()];
if (!value) {
  if (document.defaultView && document.defaultView.getComputedStyle) {
    var css = document.defaultView.getComputedStyle(element, null);
    value = css ? css.getPropertyValue(style) : null;
  } else if (element.currentStyle) {
    value = element.currentStyle[style.camelize()];
  }
}

if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
  if (Element.getStyle(element, 'position') == 'static') value = 'auto';

return value == 'auto' ? null : value;
},

setStyle: function(element, style) {
element = $(element);
for (name in style)
  element.style[name.camelize()] = style[name];
},

getDimensions: function(element) {
element = $(element);
if (Element.getStyle(element, 'display') != 'none')
  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;
els.visibility = 'hidden';
els.position = 'absolute';
els.display = '';
var originalWidth = element.clientWidth;
var originalHeight = element.clientHeight;
els.display = 'none';
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;
  element.style.position = 'relative';
  // Opera returns the offset relative to the positioning context, when an
  // element is position relative but top and left have not been defined
  if (window.opera) {
    element.style.top = 0;
    element.style.left = 0;
  }
}
},

undoPositioned: function(element) {
element = $(element);
if (element._madePositioned) {
  element._madePositioned = undefined;
  element.style.position =
    element.style.top =
    element.style.left =
    element.style.bottom =
    element.style.right = '';
}
},

makeClipping: function(element) {
element = $(element);
if (element._overflow) return;
element._overflow = element.style.overflow;
if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
  element.style.overflow = 'hidden';
},

undoClipping: function(element) {
element = $(element);
if (element._overflow) return;
element.style.overflow = element._overflow;
element._overflow = undefined;
}
});

var Toggle = new Object();
Toggle.display = Element.toggle;

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

Abstract.Insertion = function(adjacency) {
this.adjacency = adjacency;
}

Abstract.Insertion.prototype = {
initialize: function(element, content) {
this.element = $(element);
this.content = content.stripScripts();

if (this.adjacency && this.element.insertAdjacentHTML) {
  try {
    this.element.insertAdjacentHTML(this.adjacency, this.content);
  } catch (e) {
    if (this.element.tagName.toLowerCase() == 'tbody') {
      this.insertContent(this.contentFromAnonymousTable());
    } else {
      throw e;
    }
  }
} else {
  this.range = this.element.ownerDocument.createRange();
  if (this.initializeRange) this.initializeRange();
  this.insertContent([this.range.createContextualFragment(this.content)]);
}

setTimeout(function() {content.evalScripts()}, 10);
},

contentFromAnonymousTable: function() {
var div = document.createElement('div');
div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
return $A(div.childNodes[0].childNodes[0].childNodes);
}
}

var Insertion = new Object();

Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
initializeRange: function() {
this.range.setStartBefore(this.element);
},

insertContent: function(fragments) {
fragments.each((function(fragment) {
  this.element.parentNode.insertBefore(fragment, this.element);
}).bind(this));
}
});

Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
initializeRange: function() {
this.range.selectNodeContents(this.element);
this.range.collapse(true);
},

insertContent: function(fragments) {
fragments.reverse(false).each((function(fragment) {
  this.element.insertBefore(fragment, this.element.firstChild);
}).bind(this));
}
});

Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
initializeRange: function() {
this.range.selectNodeContents(this.element);
this.range.collapse(this.element);
},

insertContent: function(fragments) {
fragments.each((function(fragment) {
  this.element.appendChild(fragment);
}).bind(this));
}
});

Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
initializeRange: function() {
this.range.setStartAfter(this.element);
},

insertContent: function(fragments) {
fragments.each((function(fragment) {
  this.element.parentNode.insertBefore(fragment,
    this.element.nextSibling);
}).bind(this));
}
});

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

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
initialize: function(element) {
this.element = $(element);
},

_each: function(iterator) {
this.element.className.split(/\s+/).select(function(name) {
  return name.length > 0;
})._each(iterator);
},

set: function(className) {
this.element.className = className;
},

add: function(classNameToAdd) {
if (this.include(classNameToAdd)) return;
this.set(this.toArray().concat(classNameToAdd).join(' '));
},

remove: function(classNameToRemove) {
if (!this.include(classNameToRemove)) return;
this.set(this.select(function(className) {
  return className != classNameToRemove;
}).join(' '));
},

toString: function() {
return this.toArray().join(' ');
}
}

Object.extend(Element.ClassNames.prototype, Enumerable);
var Field = {
clear: function() {
for (var i = 0; i < arguments.length; i++)
  $(arguments[i]).value = '';
},

focus: function(element) {
$(element).focus();
},

present: function() {
for (var i = 0; i < arguments.length; i++)
  if ($(arguments[i]).value == '') return false;
return true;
},

select: function(element) {
$(element).select();
},

activate: function(element) {
element = $(element);
element.focus();
if (element.select)
  element.select();
}
}

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

var Form = {
serialize: function(form) {
var elements = Form.getElements($(form));
var queryComponents = new Array();

for (var i = 0; i < elements.length; i++) {
  var queryComponent = Form.Element.serialize(elements[i]);
  if (queryComponent)
    queryComponents.push(queryComponent);
}

return queryComponents.join('&');
},

getElements: function(form) {
form = $(form);
var elements = new Array();

for (tagName in Form.Element.Serializers) {
  var tagElements = form.getElementsByTagName(tagName);
  for (var j = 0; j < tagElements.length; j++)
    elements.push(tagElements[j]);
}
return elements;
},

getInputs: function(form, typeName, name) {
form = $(form);
var inputs = form.getElementsByTagName('input');

if (!typeName && !name)
  return inputs;

var matchingInputs = new Array();
for (var i = 0; i < inputs.length; i++) {
  var input = inputs[i];
  if ((typeName && input.type != typeName) ||
      (name && input.name != name))
    continue;
  matchingInputs.push(input);
}

return matchingInputs;
},

disable: function(form) {
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
  var element = elements[i];
  element.blur();
  element.disabled = 'true';
}
},

enable: function(form) {
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
  var element = elements[i];
  element.disabled = '';
}
},

findFirstElement: function(form) {
return Form.getElements(form).find(function(element) {
  return element.type != 'hidden' && !element.disabled &&
    ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
});
},

focusFirstElement: function(form) {
Field.activate(Form.findFirstElement(form));
},

reset: function(form) {
$(form).reset();
}
}

Form.Element = {
serialize: function(element) {
element = $(element);
var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializers[method](element);

if (parameter) {
  var key = encodeURIComponent(parameter[0]);
  if (key.length == 0) return;

  if (parameter[1].constructor != Array)
    parameter[1] = [parameter[1]];

  return parameter[1].map(function(value) {
    return key + '=' + encodeURIComponent(value);
  }).join('&');
}
},

getValue: function(element) {
element = $(element);
var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializers[method](element);

if (parameter)
  return parameter[1];
}
}

Form.Element.Serializers = {
input: function(element) {
switch (element.type.toLowerCase()) {
  case 'submit':
  case 'hidden':
  case 'password':
  case 'text':
    return Form.Element.Serializers.textarea(element);
  case 'checkbox':
  case 'radio':
    return Form.Element.Serializers.inputSelector(element);
}
return false;
},

inputSelector: function(element) {
if (element.checked)
  return [element.name, element.value];
},

textarea: function(element) {
return [element.name, element.value];
},

select: function(element) {
return Form.Element.Serializers[element.type == 'select-one' ?
  'selectOne' : 'selectMany'](element);
},

selectOne: function(element) {
var value = '', opt, index = element.selectedIndex;
if (index >= 0) {
  opt = element.options[index];
  value = opt.value;
  if (!value && !('value' in opt))
    value = opt.text;
}
return [element.name, value];
},

selectMany: function(element) {
var value = new Array();
for (var i = 0; i < element.length; i++) {
  var opt = element.options[i];
  if (opt.selected) {
    var optValue = opt.value;
    if (!optValue && !('value' in opt))
      optValue = opt.text;
    value.push(optValue);
  }
}
return [element.name, value];
}
}

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

var $F = Form.Element.getValue;

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

Abstract.TimedObserver = function() {}
Abstract.TimedObserver.prototype = {
initialize: function(element, frequency, callback) {
this.frequency = frequency;
this.element   = $(element);
this.callback  = callback;

this.lastValue = this.getValue();
this.registerCallback();
},

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

onTimerEvent: function() {
var value = this.getValue();
if (this.lastValue != value) {
  this.callback(this.element, value);
  this.lastValue = value;
}
}
}

Form.Element.Observer = Class.create();
Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
return Form.Element.getValue(this.element);
}
});

Form.Observer = Class.create();
Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
return Form.serialize(this.element);
}
});

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

Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = {
initialize: function(element, callback) {
this.element  = $(element);
this.callback = callback;

this.lastValue = this.getValue();
if (this.element.tagName.toLowerCase() == 'form')
  this.registerFormCallbacks();
else
  this.registerCallback(this.element);
},

onElementEvent: function() {
var value = this.getValue();
if (this.lastValue != value) {
  this.callback(this.element, value);
  this.lastValue = value;
}
},

registerFormCallbacks: function() {
var elements = Form.getElements(this.element);
for (var i = 0; i < elements.length; i++)
  this.registerCallback(elements[i]);
},

registerCallback: function(element) {
if (element.type) {
  switch (element.type.toLowerCase()) {
    case 'checkbox':
    case 'radio':
      Event.observe(element, 'click', this.onElementEvent.bind(this));
      break;
    case 'password':
    case 'text':
    case 'textarea':
    case 'select-one':
    case 'select-multiple':
      Event.observe(element, 'change', this.onElementEvent.bind(this));
      break;
  }
}
}
}

Form.Element.EventObserver = Class.create();
Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
return Form.Element.getValue(this.element);
}
});

Form.EventObserver = Class.create();
Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
return Form.serialize(this.element);
}
});
if (!window.Event) {
var Event = new Object();
}

Object.extend(Event, {
KEY_BACKSPACE: 8,
KEY_TAB:       9,
KEY_RETURN:   13,
KEY_ESC:      27,
KEY_LEFT:     37,
KEY_UP:       38,
KEY_RIGHT:    39,
KEY_DOWN:     40,
KEY_DELETE:   46,

element: function(event) {
return event.target || event.srcElement;
},

isLeftClick: function(event) {
return (((event.which) && (event.which == 1)) ||
        ((event.button) && (event.button == 1)));
},

pointerX: function(event) {
return event.pageX || (event.clientX +
  (document.documentElement.scrollLeft || document.body.scrollLeft));
},

pointerY: function(event) {
return event.pageY || (event.clientY +
  (document.documentElement.scrollTop || document.body.scrollTop));
},

stop: function(event) {
if (event.preventDefault) {
  event.preventDefault();
  event.stopPropagation();
} else {
  event.returnValue = false;
  event.cancelBubble = true;
}
},

// find the first node with the given tagName, starting from the
// node the event was triggered on; traverses the DOM upwards
findElement: function(event, tagName) {
var element = Event.element(event);
while (element.parentNode && (!element.tagName ||
    (element.tagName.toUpperCase() != tagName.toUpperCase())))
  element = element.parentNode;
return element;
},

observers: false,

_observeAndCache: function(element, name, observer, useCapture) {
if (!this.observers) this.observers = [];
if (element.addEventListener) {
  this.observers.push([element, name, observer, useCapture]);
  element.addEventListener(name, observer, useCapture);
} else if (element.attachEvent) {
  this.observers.push([element, name, observer, useCapture]);
  element.attachEvent('on' + name, observer);
}
},

unloadCache: function() {
if (!Event.observers) return;
for (var i = 0; i < Event.observers.length; i++) {
  Event.stopObserving.apply(this, Event.observers[i]);
  Event.observers[i][0] = null;
}
Event.observers = false;
},

observe: function(element, name, observer, useCapture) {
var element = $(element);
useCapture = useCapture || false;

if (name == 'keypress' &&
    (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
    || element.attachEvent))
  name = 'keydown';

this._observeAndCache(element, name, observer, useCapture);
},

stopObserving: function(element, name, observer, useCapture) {
var element = $(element);
useCapture = useCapture || false;

if (name == 'keypress' &&
    (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
    || element.detachEvent))
  name = 'keydown';

if (element.removeEventListener) {
  element.removeEventListener(name, observer, useCapture);
} else if (element.detachEvent) {
  element.detachEvent('on' + name, observer);
}
}
});

/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);
var Position = {
// set to true if needed, warning: firefox performance problems
// NOT neeeded for page scrolling, only if draggable contained in
// scrollable elements
includeScrollOffsets: false,

// must be called before calling withinIncludingScrolloffset, every time the
// page is scrolled
prepare: function() {
this.deltaX =  window.pageXOffset
            || document.documentElement.scrollLeft
            || document.body.scrollLeft
            || 0;
this.deltaY =  window.pageYOffset
            || document.documentElement.scrollTop
            || document.body.scrollTop
            || 0;
},

realOffset: function(element) {
var valueT = 0, valueL = 0;
do {
  valueT += element.scrollTop  || 0;
  valueL += element.scrollLeft || 0;
  element = element.parentNode;
} while (element);
return [valueL, valueT];
},

cumulativeOffset: function(element) {
var valueT = 0, valueL = 0;
do {
  valueT += element.offsetTop  || 0;
  valueL += element.offsetLeft || 0;
  element = element.offsetParent;
} while (element);
return [valueL, valueT];
},

positionedOffset: function(element) {
var valueT = 0, valueL = 0;
do {
  valueT += element.offsetTop  || 0;
  valueL += element.offsetLeft || 0;
  element = element.offsetParent;
  if (element) {
    p = Element.getStyle(element, 'position');
    if (p == 'relative' || p == 'absolute') break;
  }
} while (element);
return [valueL, valueT];
},

offsetParent: function(element) {
if (element.offsetParent) return element.offsetParent;
if (element == document.body) return element;

while ((element = element.parentNode) && element != document.body)
  if (Element.getStyle(element, 'position') != 'static')
    return element;

return document.body;
},

// caches x/y coordinate pair to use with overlap
within: function(element, x, y) {
if (this.includeScrollOffsets)
  return this.withinIncludingScrolloffsets(element, x, y);
this.xcomp = x;
this.ycomp = y;
this.offset = this.cumulativeOffset(element);

return (y >= this.offset[1] &&
        y <  this.offset[1] + element.offsetHeight &&
        x >= this.offset[0] &&
        x <  this.offset[0] + element.offsetWidth);
},

withinIncludingScrolloffsets: function(element, x, y) {
var offsetcache = this.realOffset(element);

this.xcomp = x + offsetcache[0] - this.deltaX;
this.ycomp = y + offsetcache[1] - this.deltaY;
this.offset = this.cumulativeOffset(element);

return (this.ycomp >= this.offset[1] &&
        this.ycomp <  this.offset[1] + element.offsetHeight &&
        this.xcomp >= this.offset[0] &&
        this.xcomp <  this.offset[0] + element.offsetWidth);
},

// within must be called directly before
overlap: function(mode, element) {
if (!mode) return 0;
if (mode == 'vertical')
  return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
    element.offsetHeight;
if (mode == 'horizontal')
  return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
    element.offsetWidth;
},

clone: function(source, target) {
source = $(source);
target = $(target);
target.style.position = 'absolute';
var offsets = this.cumulativeOffset(source);
target.style.top    = offsets[1] + 'px';
target.style.left   = offsets[0] + 'px';
target.style.width  = source.offsetWidth + 'px';
target.style.height = source.offsetHeight + 'px';
},

page: function(forElement) {
var valueT = 0, valueL = 0;

var element = forElement;
do {
  valueT += element.offsetTop  || 0;
  valueL += element.offsetLeft || 0;

  // Safari fix
  if (element.offsetParent==document.body)
    if (Element.getStyle(element,'position')=='absolute') break;

} while (element = element.offsetParent);

element = forElement;
do {
  valueT -= element.scrollTop  || 0;
  valueL -= element.scrollLeft || 0;
} while (element = element.parentNode);

return [valueL, valueT];
},

clone: function(source, target) {
var options = Object.extend({
  setLeft:    true,
  setTop:     true,
  setWidth:   true,
  setHeight:  true,
  offsetTop:  0,
  offsetLeft: 0
}, arguments[2] || {})

// find page position of source
source = $(source);
var p = Position.page(source);

// find coordinate system to use
target = $(target);
var delta = [0, 0];
var parent = null;
// delta [0,0] will do fine with position: fixed elements,
// position:absolute needs offsetParent deltas
if (Element.getStyle(target,'position') == 'absolute') {
  parent = Position.offsetParent(target);
  delta = Position.page(parent);
}

// correct by body offsets (fixes Safari)
if (parent == document.body) {
  delta[0] -= document.body.offsetLeft;
  delta[1] -= document.body.offsetTop;
}

// set position
if(options.setLeft)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
if(options.setHeight) target.style.height = source.offsetHeight + 'px';
},

absolutize: function(element) {
element = $(element);
if (element.style.position == 'absolute') return;
Position.prepare();

var offsets = Position.positionedOffset(element);
var top     = offsets[1];
var left    = offsets[0];
var width   = element.clientWidth;
var height  = element.clientHeight;

element._originalLeft   = left - parseFloat(element.style.left  || 0);
element._originalTop    = top  - parseFloat(element.style.top || 0);
element._originalWidth  = element.style.width;
element._originalHeight = element.style.height;

element.style.position = 'absolute';
element.style.top    = top + 'px';;
element.style.left   = left + 'px';;
element.style.width  = width + 'px';;
element.style.height = height + 'px';;
},

relativize: function(element) {
element = $(element);
if (element.style.position == 'relative') return;
Position.prepare();

element.style.position = 'relative';
var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

element.style.top    = top + 'px';
element.style.left   = left + 'px';
element.style.height = element._originalHeight;
element.style.width  = element._originalWidth;
}
}

// Safari returns margins on body which is incorrect if the child is absolutely
// positioned.  For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
Position.cumulativeOffset = function(element) {
var valueT = 0, valueL = 0;
do {
  valueT += element.offsetTop  || 0;
  valueL += element.offsetLeft || 0;
  if (element.offsetParent == document.body)
    if (Element.getStyle(element, 'position') == 'absolute') break;

  element = element.offsetParent;
} while (element);

return [valueL, valueT];
}
}