jquery/src/core.js

/*
 * jQuery @VERSION - New Wave Javascript
 *
 * Copyright (c) 2007 John Resig (jquery.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * $Date$
 * $Rev$
 */

// Map over jQuery in case of overwrite
if ( window.jQuery )
	var _jQuery = window.jQuery;

var jQuery = window.jQuery = function( selector, context ) {
	// The jQuery object is actually just the init constructor 'enhanced'
	return new jQuery.prototype.init( selector, context );
};

// Map over the $ in case of overwrite
if ( window.$ )
	var _$ = window.$;
	
// Map the jQuery namespace to the '$' one
window.$ = jQuery;

// A simple way to check for HTML strings or ID strings
// (both of which we optimize for)
var quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#(\w+)$/;

// Is it a simple selector
var isSimple = /^.[^:#\[\.]*$/;

jQuery.fn = jQuery.prototype = {
	init: function( selector, context ) {
		// Make sure that a selection was provided
		selector = selector || document;

		// Handle $(DOMElement)
		if ( selector.nodeType ) {
			this[0] = selector;
			this.length = 1;
			return this;

		// Handle HTML strings
		} else if ( typeof selector == "string" ) {
			// Are we dealing with HTML string or an ID?
			var match = quickExpr.exec( selector );

			// Verify a match, and that no context was specified for #id
			if ( match && (match[1] || !context) ) {

				// HANDLE: $(html) -> $(array)
				if ( match[1] )
					selector = jQuery.clean( [ match[1] ], context );

				// HANDLE: $("#id")
				else {
					var elem = document.getElementById( match[3] );

					// Make sure an element was located
					if ( elem )
						// Handle the case where IE and Opera return items
						// by name instead of ID
						if ( elem.id != match[3] )
							return jQuery().find( selector );

						// Otherwise, we inject the element directly into the jQuery object
						else {
							this[0] = elem;
							this.length = 1;
							return this;
						}

					else
						selector = [];
				}

			// HANDLE: $(expr, [context])
			// (which is just equivalent to: $(content).find(expr)
			} else
				return new jQuery( context ).find( selector );

		// HANDLE: $(function)
		// Shortcut for document ready
		} else if ( jQuery.isFunction( selector ) )
			return new jQuery( document )[ jQuery.fn.ready ? "ready" : "load" ]( selector );

		return this.setArray(
			// HANDLE: $(array)
			selector.constructor == Array && selector ||

			// HANDLE: $(arraylike)
			// Watch for when an array-like object, contains DOM nodes, is passed in as the selector
			(selector.jquery || selector.length && selector != window && !selector.nodeType && selector[0] != undefined && selector[0].nodeType) && jQuery.makeArray( selector ) ||

			// HANDLE: $(*)
			[ selector ] );
	},
	
	// The current version of jQuery being used
	jquery: "@VERSION",

	// The number of elements contained in the matched element set
	size: function() {
		return this.length;
	},
	
	// The number of elements contained in the matched element set
	length: 0,

	// Get the Nth element in the matched element set OR
	// Get the whole matched element set as a clean array
	get: function( num ) {
		return num == undefined ?

			// Return a 'clean' array
			jQuery.makeArray( this ) :

			// Return just the object
			this[ num ];
	},
	
	// Take an array of elements and push it onto the stack
	// (returning the new matched element set)
	pushStack: function( elems ) {
		// Build a new jQuery matched element set
		var ret = jQuery( elems );

		// Add the old object onto the stack (as a reference)
		ret.prevObject = this;

		// Return the newly-formed element set
		return ret;
	},
	
	// Force the current matched set of elements to become
	// the specified array of elements (destroying the stack in the process)
	// You should use pushStack() in order to do this, but maintain the stack
	setArray: function( elems ) {
		// Resetting the length to 0, then using the native Array push
		// is a super-fast way to populate an object with array-like properties
		this.length = 0;
		Array.prototype.push.apply( this, elems );
		
		return this;
	},

	// Execute a callback for every element in the matched set.
	// (You can seed the arguments with an array of args, but this is
	// only used internally.)
	each: function( callback, args ) {
		return jQuery.each( this, callback, args );
	},

	// Determine the position of an element within 
	// the matched set of elements
	index: function( elem ) {
		var ret = -1;

		// Locate the position of the desired element
		this.each(function(i){
			if ( this == elem )
				ret = i;
		});

		return ret;
	},

	attr: function( name, value, type ) {
		var options = name;
		
		// Look for the case where we're accessing a style value
		if ( name.constructor == String )
			if ( value == undefined )
				return this.length && jQuery[ type || "attr" ]( this[0], name ) || undefined;

			else {
				options = {};
				options[ name ] = value;
			}
		
		// Check to see if we're setting style values
		return this.each(function(i){
			// Set all the styles
			for ( name in options )
				jQuery.attr(
					type ?
						this.style :
						this,
					name, jQuery.prop( this, options[ name ], type, i, name )
				);
		});
	},

	css: function( key, value ) {
		// ignore negative width and height values
		if ( (key == 'width' || key == 'height') && parseFloat(value) < 0 )
			value = undefined;
		return this.attr( key, value, "curCSS" );
	},

	text: function( text ) {
		if ( typeof text != "object" && text != null )
			return this.empty().append( (this[0] && this[0].ownerDocument || document).createTextNode( text ) );

		var ret = "";

		jQuery.each( text || this, function(){
			jQuery.each( this.childNodes, function(){
				if ( this.nodeType != 8 )
					ret += this.nodeType != 1 ?
						this.nodeValue :
						jQuery.fn.text( [ this ] );
			});
		});

		return ret;
	},

	wrapAll: function( html ) {
		if ( this[0] )
			// The elements to wrap the target around
			jQuery( html, this[0].ownerDocument )
				.clone()
				.insertBefore( this[0] )
				.map(function(){
					var elem = this;

					while ( elem.firstChild )
						elem = elem.firstChild;

					return elem;
				})
				.append(this);

		return this;
	},

	wrapInner: function( html ) {
		return this.each(function(){
			jQuery( this ).contents().wrapAll( html );
		});
	},

	wrap: function( html ) {
		return this.each(function(){
			jQuery( this ).wrapAll( html );
		});
	},

	append: function() {
		return this.domManip(arguments, true, false, function(elem){
			if (this.nodeType == 1)
				this.appendChild( elem );
		});
	},

	prepend: function() {
		return this.domManip(arguments, true, true, function(elem){
			if (this.nodeType == 1)
				this.insertBefore( elem, this.firstChild );
		});
	},
	
	before: function() {
		return this.domManip(arguments, false, false, function(elem){
			this.parentNode.insertBefore( elem, this );
		});
	},

	after: function() {
		return this.domManip(arguments, false, true, function(elem){
			this.parentNode.insertBefore( elem, this.nextSibling );
		});
	},

	end: function() {
		return this.prevObject || jQuery( [] );
	},

	find: function( selector ) {
		var elems = jQuery.map(this, function(elem){
			return jQuery.find( selector, elem );
		});

		return this.pushStack( /[^+>] [^+>]/.test( selector ) || selector.indexOf("..") > -1 ?
			jQuery.unique( elems ) :
			elems );
	},

	clone: function( events ) {
		// Do the clone
		var ret = this.map(function(){
			if ( jQuery.browser.msie && !jQuery.isXMLDoc(this) ) {
				// IE copies events bound via attachEvent when
				// using cloneNode. Calling detachEvent on the
				// clone will also remove the events from the orignal
				// In order to get around this, we use innerHTML.
				// Unfortunately, this means some modifications to 
				// attributes in IE that are actually only stored 
				// as properties will not be copied (such as the
				// the name attribute on an input).
				var clone = this.cloneNode(true),
					container = document.createElement("div"),
					container2 = document.createElement("div");
				container.appendChild(clone);
				container2.innerHTML = container.innerHTML;
				return container2.firstChild;
			} else
				return this.cloneNode(true);
		});

		// Need to set the expando to null on the cloned set if it exists
		// removeData doesn't work here, IE removes it from the original as well
		// this is primarily for IE but the data expando shouldn't be copied over in any browser
		var clone = ret.find("*").andSelf().each(function(){
			if ( this[ expando ] != undefined )
				this[ expando ] = null;
		});
		
		// Copy the events from the original to the clone
		if ( events === true )
			this.find("*").andSelf().each(function(i){
				var events = jQuery.data( this, "events" );

				for ( var type in events )
					for ( var handler in events[ type ] )
						jQuery.event.add( clone[ i ], type, events[ type ][ handler ], events[ type ][ handler ].data );
			});

		// Return the cloned set
		return ret;
	},

	filter: function( selector ) {
		return this.pushStack(
			jQuery.isFunction( selector ) &&
			jQuery.grep(this, function(elem, i){
				return selector.call( elem, i );
			}) ||

			jQuery.multiFilter( selector, this ) );
	},

	not: function( selector ) {
		if ( selector.constructor == String )
			// test special case where just one selector is passed in
			if ( isSimple.test( selector ) )
				return this.pushStack( jQuery.multiFilter( selector, this, true ) );
			else
				selector = jQuery.multiFilter( selector, this );

		return this.filter(function() {
			return jQuery.inArray( this, selector ) < 0;
		});
	},

	add: function( selector ) {
		return !selector ? this : this.pushStack( jQuery.merge( 
			this.get(),
			selector.constructor == String ? 
				jQuery( selector ).get() :
				selector.length != undefined && (!selector.nodeName || jQuery.nodeName(selector, "form")) ?
					selector : [selector] ) );
	},

	is: function( selector ) {
		return selector ?
			jQuery.multiFilter( selector, this ).length > 0 :
			false;
	},

	hasClass: function( selector ) {
		return this.is( "." + selector );
	},
	
	val: function( value ) {
		if ( value == undefined ) {

			if ( this.length ) {
				var elem = this[0];

				// We need to handle select boxes special
				if ( jQuery.nodeName( elem, "select" ) ) {
					var index = elem.selectedIndex,
						values = [],
						options = elem.options,
						one = elem.type == "select-one";
					
					// Nothing was selected
					if ( index < 0 )
						return null;

					// Loop through all the selected options
					for ( var i = one ? index : 0, max = one ? index + 1 : options.length; i < max; i++ ) {
						var option = options[ i ];

						if ( option.selected ) {
							// Get the specifc value for the option
							value = jQuery.browser.msie && !option.attributes.value.specified ? option.text : option.value;
							
							// We don't need an array for one selects
							if ( one )
								return value;
							
							// Multi-Selects return an array
							values.push( value );
						}
					}
					
					return values;
					
				// Everything else, we just grab the value
				} else
					return (this[0].value || "").replace(/\r/g, "");

			}

		}

		return this.each(function(){
			if ( this.nodeType != 1 )
				return;

			if ( value.constructor == Array && /radio|checkbox/.test( this.type ) )
				this.checked = (jQuery.inArray(this.value, value) >= 0 ||
					jQuery.inArray(this.name, value) >= 0);

			else if ( jQuery.nodeName( this, "select" ) ) {
				var values = value.constructor == Array ?
					value :
					[ value ];

				jQuery( "option", this ).each(function(){
					this.selected = (jQuery.inArray( this.value, values ) >= 0 ||
						jQuery.inArray( this.text, values ) >= 0);
				});

				if ( !values.length )
					this.selectedIndex = -1;

			} else
				this.value = value;
		});
	},
	
	html: function( value ) {
		return value == undefined ?
			(this.length ?
				this[0].innerHTML :
				null) :
			this.empty().append( value );
	},

	replaceWith: function( value ) {
		return this.after( value ).remove();
	},

	eq: function( i ) {
		return this.slice( i, i + 1 );
	},

	slice: function() {
		return this.pushStack( Array.prototype.slice.apply( this, arguments ) );
	},

	map: function( callback ) {
		return this.pushStack( jQuery.map(this, function(elem, i){
			return callback.call( elem, i, elem );
		}));
	},

	andSelf: function() {
		return this.add( this.prevObject );
	},
	
	domManip: function( args, table, reverse, callback ) {
		var clone = this.length > 1, elems; 

		return this.each(function(){
			if ( !elems ) {
				elems = jQuery.clean( args, this.ownerDocument );

				if ( reverse )
					elems.reverse();
			}

			var obj = this;

			if ( table && jQuery.nodeName( this, "table" ) && jQuery.nodeName( elems[0], "tr" ) )
				obj = this.getElementsByTagName("tbody")[0] || this.appendChild( this.ownerDocument.createElement("tbody") );

			var scripts = jQuery( [] );

			jQuery.each(elems, function(){
				var elem = clone ?
					this.cloneNode( true ) :
					this;

				// execute all scripts after the elements have been injected
				if ( jQuery.nodeName( elem, "script" ) ) {
					scripts = scripts.add( elem );
				} else {
					// Remove any inner scripts for later evaluation
					if ( elem.nodeType == 1 )
						scripts = scripts.add( jQuery( "script", elem ).remove() );

					// Inject the elements into the document
					callback.call( obj, elem );
				}
			});

			scripts.each( evalScript );
		});
	}
};

// Give the init function the jQuery prototype for later instantiation
jQuery.prototype.init.prototype = jQuery.prototype;

function evalScript( i, elem ) {
	if ( elem.src )
		jQuery.ajax({
			url: elem.src,
			async: false,
			dataType: "script"
		});

	else
		jQuery.globalEval( elem.text || elem.textContent || elem.innerHTML || "" );

	if ( elem.parentNode )
		elem.parentNode.removeChild( elem );
}

jQuery.extend = jQuery.fn.extend = function() {
	// copy reference to target object
	var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options;

	// Handle a deep copy situation
	if ( target.constructor == Boolean ) {
		deep = target;
		target = arguments[1] || {};
		// skip the boolean and the target
		i = 2;
	}

	// Handle case when target is a string or something (possible in deep copy)
	if ( typeof target != "object" && typeof target != "function" )
		target = {};

	// extend jQuery itself if only one argument is passed
	if ( length == 1 ) {
		target = this;
		i = 0;
	}

	for ( ; i < length; i++ )
		// Only deal with non-null/undefined values
		if ( (options = arguments[ i ]) != null )
			// Extend the base object
			for ( var name in options ) {
				// Prevent never-ending loop
				if ( target === options[ name ] )
					continue;

				// Recurse if we're merging object values
				if ( deep && options[ name ] && typeof options[ name ] == "object" && target[ name ] && !options[ name ].nodeType )
					target[ name ] = jQuery.extend( target[ name ], options[ name ] );

				// Don't bring in undefined values
				else if ( options[ name ] != undefined )
					target[ name ] = options[ name ];

			}

	// Return the modified object
	return target;
};

var expando = "jQuery" + (new Date()).getTime(), uuid = 0, windowData = {};

// exclude the following css properties to add px
var exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i;

jQuery.extend({
	noConflict: function( deep ) {
		window.$ = _$;

		if ( deep )
			window.jQuery = _jQuery;

		return jQuery;
	},

	// This may seem like some crazy code, but trust me when I say that this
	// is the only cross-browser way to do this. --John
	isFunction: function( fn ) {
		return !!fn && typeof fn != "string" && !fn.nodeName && 
			fn.constructor != Array && /function/i.test( fn + "" );
	},
	
	// check if an element is in a (or is an) XML document
	isXMLDoc: function( elem ) {
		return elem.documentElement && !elem.body ||
			elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;
	},

	// Evalulates a script in a global context
	globalEval: function( data ) {
		data = jQuery.trim( data );

		if ( data ) {
			// Inspired by code by Andrea Giammarchi
			// http://webreflection.blogspot.com/2007/08/global-scope-evaluation-and-dom.html
			var head = document.getElementsByTagName("head")[0] || document.documentElement,
				script = document.createElement("script");

			script.type = "text/javascript";
			if ( jQuery.browser.msie )
				script.text = data;
			else
				script.appendChild( document.createTextNode( data ) );

			head.appendChild( script );
			head.removeChild( script );
		}
	},

	nodeName: function( elem, name ) {
		return elem.nodeName && elem.nodeName.toUpperCase() == name.toUpperCase();
	},
	
	cache: {},
	
	data: function( elem, name, data ) {
		elem = elem == window ?
			windowData :
			elem;

		var id = elem[ expando ];

		// Compute a unique ID for the element
		if ( !id ) 
			id = elem[ expando ] = ++uuid;

		// Only generate the data cache if we're
		// trying to access or manipulate it
		if ( name && !jQuery.cache[ id ] )
			jQuery.cache[ id ] = {};
		
		// Prevent overriding the named cache with undefined values
		if ( data != undefined )
			jQuery.cache[ id ][ name ] = data;
		
		// Return the named cache data, or the ID for the element	
		return name ?
			jQuery.cache[ id ][ name ] :
			id;
	},
	
	removeData: function( elem, name ) {
		elem = elem == window ?
			windowData :
			elem;

		var id = elem[ expando ];

		// If we want to remove a specific section of the element's data
		if ( name ) {
			if ( jQuery.cache[ id ] ) {
				// Remove the section of cache data
				delete jQuery.cache[ id ][ name ];

				// If we've removed all the data, remove the element's cache
				name = "";

				for ( name in jQuery.cache[ id ] )
					break;

				if ( !name )
					jQuery.removeData( elem );
			}

		// Otherwise, we want to remove all of the element's data
		} else {
			// Clean up the element expando
			try {
				delete elem[ expando ];
			} catch(e){
				// IE has trouble directly removing the expando
				// but it's ok with using removeAttribute
				if ( elem.removeAttribute )
					elem.removeAttribute( expando );
			}

			// Completely remove the data cache
			delete jQuery.cache[ id ];
		}
	},

	// args is for internal usage only
	each: function( object, callback, args ) {
		if ( args ) {
			if ( object.length == undefined )
				for ( var name in object )
					callback.apply( object[ name ], args );
			else
				for ( var i = 0, length = object.length; i < length; i++ )
					if ( callback.apply( object[ i ], args ) === false )
						break;

		// A special, fast, case for the most common use of each
		} else {
			if ( object.length == undefined )
				for ( var name in object )
					callback.call( object[ name ], name, object[ name ] );
			else
				for ( var i = 0, length = object.length, value = object[0]; 
					i < length && callback.call( value, i, value ) !== false; value = object[++i] ){}
		}

		return object;
	},
	
	prop: function( elem, value, type, i, name ) {
			// Handle executable functions
			if ( jQuery.isFunction( value ) )
				value = value.call( elem, i );
				
			// Handle passing in a number to a CSS property
			return value && value.constructor == Number && type == "curCSS" && !exclude.test( name ) ?
				value + "px" :
				value;
	},

	className: {
		// internal only, use addClass("class")
		add: function( elem, classNames ) {
			jQuery.each((classNames || "").split(/\s+/), function(i, className){
				if ( elem.nodeType == 1 && !jQuery.className.has( elem.className, className ) )
					elem.className += (elem.className ? " " : "") + className;
			});
		},

		// internal only, use removeClass("class")
		remove: function( elem, classNames ) {
			if (elem.nodeType == 1)
				elem.className = classNames != undefined ?
					jQuery.grep(elem.className.split(/\s+/), function(className){
						return !jQuery.className.has( classNames, className );	
					}).join(" ") :
					"";
		},

		// internal only, use is(".class")
		has: function( elem, className ) {
			return jQuery.inArray( className, (elem.className || elem).toString().split(/\s+/) ) > -1;
		}
	},

	// A method for quickly swapping in/out CSS properties to get correct calculations
	swap: function( elem, options, callback ) {
		// Remember the old values, and insert the new ones
		for ( var name in options ) {
			elem.style[ "old" + name ] = elem.style[ name ];
			elem.style[ name ] = options[ name ];
		}

		callback.call( elem );

		// Revert the old values
		for ( var name in options )
			elem.style[ name ] = elem.style[ "old" + name ];
	},

	css: function( elem, name, force ) {
		if ( name == "width" || name == "height" ) {
			var width, height, props = { position: "absolute", visibility: "hidden", display:"block" };
		
			function getWH() {
				width = elem.clientWidth;
				height = elem.clientHeight;
			}
		
			if ( jQuery(elem).is(":visible") )
				getWH();
			else
				jQuery.swap( elem, props, getWH );

			return name == "width" ? width : height;
		}
		
		return jQuery.curCSS( elem, name, force );
	},

	curCSS: function( elem, name, force ) {
		var ret;

		// A helper method for determining if an element's values are broken
		function color( elem ) {
			if ( !jQuery.browser.safari )
				return false;

			var ret = document.defaultView.getComputedStyle( elem, null );
			return !ret || ret.getPropertyValue("color") == "";
		}

		// We need to handle opacity special in IE
		if ( name == "opacity" && jQuery.browser.msie ) {
			ret = jQuery.attr( elem.style, "opacity" );

			return ret == "" ?
				"1" :
				ret;
		}
		// Opera sometimes will give the wrong display answer, this fixes it, see #2037
		if ( jQuery.browser.opera && name == "display" ) {
			var save = elem.style.display;
			elem.style.display = "block";
			elem.style.display = save;
		}
		
		// Make sure we're using the right name for getting the float value
		if ( name.match( /float/i ) )
			name = styleFloat;

		if ( !force && elem.style[ name ] )
			ret = elem.style[ name ];

		else if ( document.defaultView && document.defaultView.getComputedStyle ) {

			// Only "float" is needed here
			if ( name.match( /float/i ) )
				name = "float";

			name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();

			var getComputedStyle = document.defaultView.getComputedStyle( elem, null );

			if ( getComputedStyle && !color( elem ) )
				ret = getComputedStyle.getPropertyValue( name );

			// If the element isn't reporting its values properly in Safari
			// then some display: none elements are involved
			else {
				var swap = [], stack = [];

				// Locate all of the parent display: none elements
				for ( var a = elem; a && color(a); a = a.parentNode )
					stack.unshift(a);

				// Go through and make them visible, but in reverse
				// (It would be better if we knew the exact display type that they had)
				for ( var i = 0; i < stack.length; i++ )
					if ( color( stack[ i ] ) ) {
						swap[ i ] = stack[ i ].style.display;
						stack[ i ].style.display = "block";
					}

				// Since we flip the display style, we have to handle that
				// one special, otherwise get the value
				ret = name == "display" && swap[ stack.length - 1 ] != null ?
					"none" :
					( getComputedStyle && getComputedStyle.getPropertyValue( name ) ) || "";

				// Finally, revert the display styles back
				for ( var i = 0; i < swap.length; i++ )
					if ( swap[ i ] != null )
						stack[ i ].style.display = swap[ i ];
			}

			// We should always get a number back from opacity
			if ( name == "opacity" && ret == "" )
				ret = "1";

		} else if ( elem.currentStyle ) {
			var camelCase = name.replace(/\-(\w)/g, function(all, letter){
				return letter.toUpperCase();
			});

			ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];

			// From the awesome hack by Dean Edwards
			// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291

			// If we're not dealing with a regular pixel number
			// but a number that has a weird ending, we need to convert it to pixels
			if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
				// Remember the original values
				var style = elem.style.left, runtimeStyle = elem.runtimeStyle.left;

				// Put in the new values to get a computed value out
				elem.runtimeStyle.left = elem.currentStyle.left;
				elem.style.left = ret || 0;
				ret = elem.style.pixelLeft + "px";

				// Revert the changed values
				elem.style.left = style;
				elem.runtimeStyle.left = runtimeStyle;
			}
		}

		return ret;
	},
	
	clean: function( elems, context ) {
		var ret = [];
		context = context || document;
		// !context.createElement fails in IE with an error but returns typeof 'object'
		if (typeof context.createElement == 'undefined') 
			context = context.ownerDocument || context[0] && context[0].ownerDocument || document;

		jQuery.each(elems, function(i, elem){
			if ( !elem )
				return;

			if ( elem.constructor == Number )
				elem = elem.toString();
			
			// Convert html string into DOM nodes
			if ( typeof elem == "string" ) {
				// Fix "XHTML"-style tags in all browsers
				elem = elem.replace(/(<(\w+)[^>]*?)\/>/g, function(all, front, tag){
					return tag.match(/^(abbr|br|col|img|input|link|meta|param|hr|area)$/i) ?
						all :
						front + "></" + tag + ">";
				});

				// Trim whitespace, otherwise indexOf won't work as expected
				var tags = jQuery.trim( elem ).toLowerCase(), div = context.createElement("div");

				var wrap =
					// option or optgroup
					!tags.indexOf("<opt") &&
					[ 1, "<select multiple='multiple'>", "</select>" ] ||
					
					!tags.indexOf("<leg") &&
					[ 1, "<fieldset>", "</fieldset>" ] ||
					
					tags.match(/^<(thead|tbody|tfoot|colg|cap)/) &&
					[ 1, "<table>", "</table>" ] ||
					
					!tags.indexOf("<tr") &&
					[ 2, "<table><tbody>", "</tbody></table>" ] ||
					
				 	// <thead> matched above
					(!tags.indexOf("<td") || !tags.indexOf("<th")) &&
					[ 3, "<table><tbody><tr>", "</tr></tbody></table>" ] ||
					
					!tags.indexOf("<col") &&
					[ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ] ||

					// IE can't serialize <link> and <script> tags normally
					jQuery.browser.msie &&
					[ 1, "div<div>", "</div>" ] ||
					
					[ 0, "", "" ];

				// Go to html and back, then peel off extra wrappers
				div.innerHTML = wrap[1] + elem + wrap[2];
				
				// Move to the right depth
				while ( wrap[0]-- )
					div = div.lastChild;
				
				// Remove IE's autoinserted <tbody> from table fragments
				if ( jQuery.browser.msie ) {
					
					// String was a <table>, *may* have spurious <tbody>
					var tbody = !tags.indexOf("<table") && tags.indexOf("<tbody") < 0 ?
						div.firstChild && div.firstChild.childNodes :
						
						// String was a bare <thead> or <tfoot>
						wrap[1] == "<table>" && tags.indexOf("<tbody") < 0 ?
							div.childNodes :
							[];
				
					for ( var j = tbody.length - 1; j >= 0 ; --j )
						if ( jQuery.nodeName( tbody[ j ], "tbody" ) && !tbody[ j ].childNodes.length )
							tbody[ j ].parentNode.removeChild( tbody[ j ] );
					
					// IE completely kills leading whitespace when innerHTML is used	
					if ( /^\s/.test( elem ) )	
						div.insertBefore( context.createTextNode( elem.match(/^\s*/)[0] ), div.firstChild );
				
				}
				
				elem = jQuery.makeArray( div.childNodes );
			}

			if ( elem.length === 0 && (!jQuery.nodeName( elem, "form" ) && !jQuery.nodeName( elem, "select" )) )
				return;

			if ( elem[0] == undefined || jQuery.nodeName( elem, "form" ) || elem.options )
				ret.push( elem );

			else
				ret = jQuery.merge( ret, elem );

		});

		return ret;
	},
	
	attr: function( elem, name, value ) {
		// don't set attributes on text and comment nodes
		if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
			return undefined;

		var fix = jQuery.isXMLDoc( elem ) ?
			{} :
			jQuery.props;

		// Safari mis-reports the default selected property of a hidden option
		// Accessing the parent's selectedIndex property fixes it
		if ( name == "selected" && jQuery.browser.safari )
			elem.parentNode.selectedIndex;
		
		// Certain attributes only work when accessed via the old DOM 0 way
		if ( fix[ name ] ) {
			if ( value != undefined )
				elem[ fix[ name ] ] = value;

			return elem[ fix[ name ] ];

		} else if ( jQuery.browser.msie && name == "style" )
			return jQuery.attr( elem.style, "cssText", value );

		else if ( value == undefined && jQuery.browser.msie && jQuery.nodeName( elem, "form" ) && (name == "action" || name == "method") )
			return elem.getAttributeNode( name ).nodeValue;

		// IE elem.getAttribute passes even for style
		else if ( elem.tagName ) {

			if ( value != undefined ) {
				// We can't allow the type property to be changed (since it causes problems in IE)
				if ( name == "type" && jQuery.nodeName( elem, "input" ) && elem.parentNode )
					throw "type property can't be changed";

				// convert the value to a string (all browsers do this but IE) see #1070
				elem.setAttribute( name, "" + value );
			}

			if ( jQuery.browser.msie && /href|src/.test( name ) && !jQuery.isXMLDoc( elem ) ) 
				return elem.getAttribute( name, 2 );

			return elem.getAttribute( name );

		// elem is actually elem.style ... set the style
		} else {
			// IE actually uses filters for opacity
			if ( name == "opacity" && jQuery.browser.msie ) {
				if ( value != undefined ) {
					// IE has trouble with opacity if it does not have layout
					// Force it by setting the zoom level
					elem.zoom = 1; 
	
					// Set the alpha filter to set the opacity
					elem.filter = (elem.filter || "").replace( /alpha\([^)]*\)/, "" ) +
						(parseFloat( value ).toString() == "NaN" ? "" : "alpha(opacity=" + value * 100 + ")");
				}
	
				return elem.filter && elem.filter.indexOf("opacity=") >= 0 ?
					(parseFloat( elem.filter.match(/opacity=([^)]*)/)[1] ) / 100).toString() :
					"";
			}

			name = name.replace(/-([a-z])/ig, function(all, letter){
				return letter.toUpperCase();
			});

			if ( value != undefined )
				elem[ name ] = value;

			return elem[ name ];
		}
	},
	
	trim: function( text ) {
		return (text || "").replace( /^\s+|\s+$/g, "" );
	},

	makeArray: function( array ) {
		var ret = [];

		// Need to use typeof to fight Safari childNodes crashes
		if ( typeof array != "array" )
			for ( var i = 0, length = array.length; i < length; i++ )
				ret.push( array[ i ] );
		else
			ret = array.slice( 0 );

		return ret;
	},

	inArray: function( elem, array ) {
		for ( var i = 0, length = array.length; i < length; i++ )
			if ( array[ i ] == elem )
				return i;

		return -1;
	},

	merge: function( first, second ) {
		// We have to loop this way because IE & Opera overwrite the length
		// expando of getElementsByTagName

		// Also, we need to make sure that the correct elements are being returned
		// (IE returns comment nodes in a '*' query)
		if ( jQuery.browser.msie ) {
			for ( var i = 0; second[ i ]; i++ )
				if ( second[ i ].nodeType != 8 )
					first.push( second[ i ] );

		} else
			for ( var i = 0; second[ i ]; i++ )
				first.push( second[ i ] );

		return first;
	},

	unique: function( array ) {
		var ret = [], done = {};

		try {

			for ( var i = 0, length = array.length; i < length; i++ ) {
				var id = jQuery.data( array[ i ] );

				if ( !done[ id ] ) {
					done[ id ] = true;
					ret.push( array[ i ] );
				}
			}

		} catch( e ) {
			ret = array;
		}

		return ret;
	},

	grep: function( elems, callback, inv ) {
		// If a string is passed in for the function, make a function
		// for it (a handy shortcut)
		if ( typeof callback == "string" )
			callback = eval("false||function(a,i){return " + callback + "}");

		var ret = [];

		// Go through the array, only saving the items
		// that pass the validator function
		for ( var i = 0, length = elems.length; i < length; i++ )
			if ( !inv && callback( elems[ i ], i ) || inv && !callback( elems[ i ], i ) )
				ret.push( elems[ i ] );

		return ret;
	},

	map: function( elems, callback ) {
		var ret = [];

		// Go through the array, translating each of the items to their
		// new value (or values).
		for ( var i = 0, length = elems.length; i < length; i++ ) {
			var value = callback( elems[ i ], i );

			if ( value !== null && value != undefined ) {
				if ( value.constructor != Array )
					value = [ value ];

				ret = ret.concat( value );
			}
		}

		return ret;
	}
});

var userAgent = navigator.userAgent.toLowerCase();

// Figure out what browser is being used
jQuery.browser = {
	version: (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [])[1],
	safari: /webkit/.test( userAgent ),
	opera: /opera/.test( userAgent ),
	msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ),
	mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )
};

var styleFloat = jQuery.browser.msie ?
	"styleFloat" :
	"cssFloat";
	
jQuery.extend({
	// Check to see if the W3C box model is being used
	boxModel: !jQuery.browser.msie || document.compatMode == "CSS1Compat",
	
	props: {
		"for": "htmlFor",
		"class": "className",
		"float": styleFloat,
		cssFloat: styleFloat,
		styleFloat: styleFloat,
		innerHTML: "innerHTML",
		className: "className",
		value: "value",
		disabled: "disabled",
		checked: "checked",
		readonly: "readOnly",
		selected: "selected",
		maxlength: "maxLength",
		selectedIndex: "selectedIndex",
		defaultValue: "defaultValue",
		tagName: "tagName",
		nodeName: "nodeName"
	}
});

jQuery.each({
	parent: "elem.parentNode",
	parents: "jQuery.dir(elem,'parentNode')",
	next: "jQuery.nth(elem,2,'nextSibling')",
	prev: "jQuery.nth(elem,2,'previousSibling')",
	nextAll: "jQuery.dir(elem,'nextSibling')",
	prevAll: "jQuery.dir(elem,'previousSibling')",
	siblings: "jQuery.sibling(elem.parentNode.firstChild,elem)",
	children: "jQuery.sibling(elem.firstChild)",
	contents: "jQuery.nodeName(elem,'iframe')?elem.contentDocument||elem.contentWindow.document:jQuery.makeArray(elem.childNodes)"
}, function(name, fn){
	fn = eval("false||function(elem){return " + fn + "}");

	jQuery.fn[ name ] = function( selector ) {
		var ret = jQuery.map( this, fn );

		if ( selector && typeof selector == "string" )
			ret = jQuery.multiFilter( selector, ret );

		return this.pushStack( jQuery.unique( ret ) );
	};
});

jQuery.each({
	appendTo: "append",
	prependTo: "prepend",
	insertBefore: "before",
	insertAfter: "after",
	replaceAll: "replaceWith"
}, function(name, original){
	jQuery.fn[ name ] = function() {
		var args = arguments;

		return this.each(function(){
			for ( var i = 0, length = args.length; i < length; i++ )
				jQuery( args[ i ] )[ original ]( this );
		});
	};
});

jQuery.each({
	removeAttr: function( name ) {
		jQuery.attr( this, name, "" );
		if (this.nodeType == 1) 
			this.removeAttribute( name );
	},

	addClass: function( classNames ) {
		jQuery.className.add( this, classNames );
	},

	removeClass: function( classNames ) {
		jQuery.className.remove( this, classNames );
	},

	toggleClass: function( classNames ) {
		jQuery.className[ jQuery.className.has( this, classNames ) ? "remove" : "add" ]( this, classNames );
	},

	remove: function( selector ) {
		if ( !selector || jQuery.filter( selector, [ this ] ).r.length ) {
			// Prevent memory leaks
			jQuery( "*", this ).add(this).each(function(){
				jQuery.event.remove(this);
				jQuery.removeData(this);
			});
			if (this.parentNode)
				this.parentNode.removeChild( this );
		}
	},

	empty: function() {
		// Remove element nodes and prevent memory leaks
		jQuery( ">*", this ).remove();
		
		// Remove any remaining nodes
		while ( this.firstChild )
			this.removeChild( this.firstChild );
	}
}, function(name, fn){
	jQuery.fn[ name ] = function(){
		return this.each( fn, arguments );
	};
});

jQuery.each([ "Height", "Width" ], function(i, name){
	var type = name.toLowerCase();
	
	jQuery.fn[ type ] = function( size ) {
		// Get window width or height
		return this[0] == window ?
			// Opera reports document.body.client[Width/Height] properly in both quirks and standards
			jQuery.browser.opera && document.body[ "client" + name ] || 
			
			// Safari reports inner[Width/Height] just fine (Mozilla and Opera include scroll bar widths)
			jQuery.browser.safari && window[ "inner" + name ] ||
			
			// Everyone else use document.documentElement or document.body depending on Quirks vs Standards mode
			document.compatMode == "CSS1Compat" && document.documentElement[ "client" + name ] || document.body[ "client" + name ] :
		
			// Get document width or height
			this[0] == document ?
				// Either scroll[Width/Height] or offset[Width/Height], whichever is greater
				Math.max( 
					Math.max(document.body["scroll" + name], document.documentElement["scroll" + name]), 
					Math.max(document.body["offset" + name], document.documentElement["offset" + name]) 
				) :

				// Get or set width or height on the element
				size == undefined ?
					// Get width or height on the element
					(this.length ? jQuery.css( this[0], type ) : null) :

					// Set the width or height on the element (default to pixels if value is unitless)
					this.css( type, size.constructor == String ? size : size + "px" );
	};
});