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	 * Return parsed XML if content-type header is "xml" and type is "xml" or omitted,
	 * otherwise return plain text.
	 * (String) data - The type of data that you're expecting back,
	 * (e.g. "xml", "html", "script")
	 */
	httpData: function( r, type ) {
		var ct = r.getResponseHeader("content-type");
		var data = !type && ct && ct.indexOf("xml") >= 0;
		data = type == "xml" || data ? r.responseXML : r.responseText;

		// If the type is "script", eval it in global context
		if ( type == "script" )
			jQuery.globalEval( data );

		// Get the JavaScript object, if JSON is used.
		if ( type == "json" )
			eval( "data = " + data );

		// evaluate scripts within html
		if ( type == "html" )
			jQuery("<div>").html(data).evalScripts();

		return data;
	},

	// Serialize an array of form elements or a set of
	// key/values into a query string
	param: function( a ) {
		var s = [];

		// If an array was passed in, assume that it is an array
		// of form elements
		if ( a.constructor == Array || a.jquery )
			// Serialize the form elements
			jQuery.each( a, function(){
				s.push( encodeURIComponent(this.name) + "=" + encodeURIComponent( this.value ) );
			});

		// Otherwise, assume that it's an object of key/value pairs
		else
			// Serialize the key/values
			for ( var j in a )
				// If the value is an array then the key names need to be repeated
				if ( a[j] && a[j].constructor == Array )
					jQuery.each( a[j], function(){
						s.push( encodeURIComponent(j) + "=" + encodeURIComponent( this ) );
					});
				else
					s.push( encodeURIComponent(j) + "=" + encodeURIComponent( a[j] ) );

		// Return the resulting serialization
		return s.join("&");
	},
	
	// evalulates a script in global context
	// not reliable for safari
	globalEval: function( data ) {
		if ( window.execScript )
			window.execScript( data );
		else if ( jQuery.browser.safari )
			// safari doesn't provide a synchronous global eval
			window.setTimeout( data, 0 );
		else
			eval.call( window, data );
	}

});
jQuery.fn.extend({

	show: function(speed,callback){
		var hidden = this.filter(":hidden");
		speed ?
			hidden.animate({
				height: "show", width: "show", opacity: "show"
			}, speed, callback) :
			
			hidden.each(function(){
				this.style.display = this.oldblock ? this.oldblock : "";
				if ( jQuery.css(this,"display") == "none" )
					this.style.display = "block";
			});
		return this;
	},

	hide: function(speed,callback){
		var visible = this.filter(":visible");
		speed ?
			visible.animate({
				height: "hide", width: "hide", opacity: "hide"
			}, speed, callback) :
			
			visible.each(function(){
				this.oldblock = this.oldblock || jQuery.css(this,"display");
				if ( this.oldblock == "none" )
					this.oldblock = "block";
				this.style.display = "none";
			});
		return this;
	},

	// Save the old toggle function
	_toggle: jQuery.fn.toggle,
	toggle: function( fn, fn2 ){
		var args = arguments;
		return jQuery.isFunction(fn) && jQuery.isFunction(fn2) ?
			this._toggle( fn, fn2 ) :
			this.each(function(){
				jQuery(this)[ jQuery(this).is(":hidden") ? "show" : "hide" ]
					.apply( jQuery(this), args );
			});
	},
	slideDown: function(speed,callback){
		return this.animate({height: "show"}, speed, callback);
	},
	slideUp: function(speed,callback){
		return this.animate({height: "hide"}, speed, callback);
	},
	slideToggle: function(speed, callback){
		return this.each(function(){
			var state = jQuery(this).is(":hidden") ? "show" : "hide";
			jQuery(this).animate({height: state}, speed, callback);