jQuery.fn.extend({

	// overwrite the old show method
	_show: jQuery.fn.show,
	
	/**
	 * Show all matched elements using a graceful animation.
	 * The height, width, and opacity of each of the matched elements 
	 * are changed dynamically according to the specified speed.
	 *
	 * @example $("p").show("slow");
	 *
	 * @name show
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @cat Effects/Animations
	 */
	 
	/**
	 * Show all matched elements using a graceful animation and firing a callback
	 * function after completion.
	 * The height, width, and opacity of each of the matched elements 
	 * are changed dynamically according to the specified speed.
	 *
	 * @example $("p").show("slow",function(){
	 *   alert("Animation Done.");
	 * });
	 *
	 * @name show
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	show: function(speed,callback){
		return speed ? this.animate({
			height: "show", width: "show", opacity: "show"
		}, speed, callback) : this._show();
	},
	
	// Overwrite the old hide method
	_hide: jQuery.fn.hide,
	
	/**
	 * Hide all matched elements using a graceful animation.
	 * The height, width, and opacity of each of the matched elements 
	 * are changed dynamically according to the specified speed.
	 *
	 * @example $("p").hide("slow");
	 *
	 * @name hide
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @cat Effects/Animations
	 */
	 
	/**
	 * Hide all matched elements using a graceful animation and firing a callback
	 * function after completion.
	 * The height, width, and opacity of each of the matched elements 
	 * are changed dynamically according to the specified speed.
	 *
	 * @example $("p").hide("slow",function(){
	 *   alert("Animation Done.");
	 * });
	 *
	 * @name hide
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	hide: function(speed,callback){
		return speed ? this.animate({
			height: "hide", width: "hide", opacity: "hide"
		}, speed, callback) : this._hide();
	},
	
	/**
	 * Reveal all matched elements by adjusting their height.
	 * Only the height is adjusted for this animation, causing all matched
	 * elements to be revealed in a "sliding" manner.
	 *
	 * @example $("p").slideDown("slow");
	 *
	 * @name slideDown
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @cat Effects/Animations
	 */
	 
	/**
	 * Reveal all matched elements by adjusting their height and firing a callback
	 * function after completion.
	 * Only the height is adjusted for this animation, causing all matched
	 * elements to be revealed in a "sliding" manner.
	 *
	 * @example $("p").slideDown("slow",function(){
	 *   alert("Animation Done.");
	 * });
	 *
	 * @name slideDown
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	slideDown: function(speed,callback){
		return this.animate({height: "show"}, speed, callback);
	},
	
	/**
	 * Hide all matched elements by adjusting their height.
	 * Only the height is adjusted for this animation, causing all matched
	 * elements to be hidden in a "sliding" manner.
	 *
	 * @example $("p").slideUp("slow");
	 *
	 * @name slideUp
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @cat Effects/Animations
	 */
	 
	/**
	 * Hide all matched elements by adjusting their height and firing a callback
	 * function after completion.
	 * Only the height is adjusted for this animation, causing all matched
	 * elements to be hidden in a "sliding" manner.
	 *
	 * @example $("p").slideUp("slow",function(){
	 *   alert("Animation Done.");
	 * });
	 *
	 * @name slideUp
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	slideUp: function(speed,callback){
		return this.animate({height: "hide"}, speed, callback);
	},

	/**
	 * Toggle the visibility of all matched elements by adjusting their height.
	 * Only the height is adjusted for this animation, causing all matched
	 * elements to be hidden in a "sliding" manner.
	 *
	 * @example $("p").slideToggle("slow");
	 *
	 * @name slideToggle
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @cat Effects/Animations
	 */
	 
	/**
	 * Toggle the visibility of all matched elements by adjusting their height
	 * and firing a callback function after completion.
	 * Only the height is adjusted for this animation, causing all matched
	 * elements to be hidden in a "sliding" manner.
	 *
	 * @example $("p").slideToggle("slow",function(){
	 *   alert("Animation Done.");
	 * });
	 *
	 * @name slideToggle
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	slideToggle: function(speed,callback){
		return this.each(function(){
			var state = jQuery(this).is(":hidden") ? "show" : "hide";
			jQuery(this).animate({height: state}, speed, callback);
		});
	},
	
	/**
	 * Fade in all matched elements by adjusting their opacity.
	 * Only the opacity is adjusted for this animation, meaning that
	 * all of the matched elements should already have some form of height
	 * and width associated with them.
	 *
	 * @example $("p").fadeIn("slow");
	 *
	 * @name fadeIn
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @cat Effects/Animations
	 */
	 
	/**
	 * Fade in all matched elements by adjusting their opacity and firing a 
	 * callback function after completion.
	 * Only the opacity is adjusted for this animation, meaning that
	 * all of the matched elements should already have some form of height
	 * and width associated with them.
	 *
	 * @example $("p").fadeIn("slow",function(){
	 *   alert("Animation Done.");
	 * });
	 *
	 * @name fadeIn
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	fadeIn: function(speed,callback){
		return this.animate({opacity: "show"}, speed, callback);
	},
	
	/**
	 * Fade out all matched elements by adjusting their opacity.
	 * Only the opacity is adjusted for this animation, meaning that
	 * all of the matched elements should already have some form of height
	 * and width associated with them.
	 *
	 * @example $("p").fadeOut("slow");
	 *
	 * @name fadeOut
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @cat Effects/Animations
	 */
	 
	/**
	 * Fade out all matched elements by adjusting their opacity and firing a 
	 * callback function after completion.
	 * Only the opacity is adjusted for this animation, meaning that
	 * all of the matched elements should already have some form of height
	 * and width associated with them.
	 *
	 * @example $("p").fadeOut("slow",function(){
	 *   alert("Animation Done.");
	 * });
	 *
	 * @name fadeOut
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	fadeOut: function(speed,callback){
		return this.animate({opacity: "hide"}, speed, callback);
	},
	
	/**
	 * Fade the opacity of all matched elements to a specified opacity.
	 * Only the opacity is adjusted for this animation, meaning that
	 * all of the matched elements should already have some form of height
	 * and width associated with them.
	 *
	 * @example $("p").fadeTo("slow", 0.5);
	 *
	 * @name fadeTo
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Number opacity The opacity to fade to (a number from 0 to 1).
	 * @cat Effects/Animations
	 */
	 
	/**
	 * Fade the opacity of all matched elements to a specified opacity and 
	 * firing a callback function after completion.
	 * Only the opacity is adjusted for this animation, meaning that
	 * all of the matched elements should already have some form of height
	 * and width associated with them.
	 *
	 * @example $("p").fadeTo("slow", 0.5, function(){
	 *   alert("Animation Done.");
	 * });
	 *
	 * @name fadeTo
	 * @type jQuery
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Number opacity The opacity to fade to (a number from 0 to 1).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	fadeTo: function(speed,to,callback){
		return this.animate({opacity: to}, speed, callback);
	},
	
	/**
	 * A function for making your own, custom, animations. The key aspect of
	 * this function is the object of style properties that will be animated,
	 * and to what end. Each key within the object represents a style property
	 * that will also be animated (for example: "height", "top", or "opacity").
	 *
	 * The value associated with the key represents to what end the property
	 * will be animated. If a number is provided as the value, then the style
	 * property will be transitioned from its current state to that new number.
	 * Oterwise if the string "hide", "show", or "toggle" is provided, a default
	 * animation will be constructed for that property.
	 *
	 * @example $("p").animate({
	 *   height: 'toggle', opacity: 'toggle'
	 * }, "slow");
	 *
	 * @example $("p").animate({
	 *   left: 50, opacity: 'show'
	 * }, 500);
	 *
	 * @test stop();
	 * var hash = {opacity: 'show'};
	 * var hashCopy = $.extend({}, hash);
	 * $('#foo').animate(hash, 'fast', function() {
	 *  ok( hash.opacity == hashCopy.opacity, 'Check if animate changed the hash parameter' );
	 *  start();
	 * });
	 *
	 * @name animate
	 * @type jQuery
	 * @param Hash params A set of style attributes that you wish to animate, and to what end.
	 * @param Object speed A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).
	 * @param Function callback A function to be executed whenever the animation completes.
	 * @cat Effects/Animations
	 */
	animate: function(prop,speed,callback) {
		return this.queue(function(){
		
			this.curAnim = jQuery.extend({}, prop);
			
			for ( var p in prop ) {
				var e = new jQuery.fx( this, jQuery.speed(speed,callback), p );
				if ( prop[p].constructor == Number )
					e.custom( e.cur(), prop[p] );
				else
					e[ prop[p] ]( prop );
			}
			
		});
	},
	
	/**
	 *
	 * @private
	 */
	queue: function(type,fn){
		if ( !fn ) {
			fn = type;
			type = "fx";
		}
	
		return this.each(function(){
			if ( !this.queue )
				this.queue = {};
	
			if ( !this.queue[type] )
				this.queue[type] = [];
	
			this.queue[type].push( fn );
		
			if ( this.queue[type].length == 1 )
				fn.apply(this);
		});
	}

});

jQuery.extend({

	setAuto: function(e,p) {
		if ( e.notAuto ) return;

		if ( p == "height" && e.scrollHeight != parseInt(jQuery.curCSS(e,p)) ) return;
		if ( p == "width" && e.scrollWidth != parseInt(jQuery.curCSS(e,p)) ) return;

		// Remember the original height
		var a = e.style[p];

		// Figure out the size of the height right now
		var o = jQuery.curCSS(e,p,1);

		if ( p == "height" && e.scrollHeight != o ||
			p == "width" && e.scrollWidth != o ) return;

		// Set the height to auto
		e.style[p] = e.currentStyle ? "" : "auto";

		// See what the size of "auto" is
		var n = jQuery.curCSS(e,p,1);

		// Revert back to the original size
		if ( o != n && n != "auto" ) {
			e.style[p] = a;
			e.notAuto = true;
		}
	},
	
	speed: function(s,o) {
		o = o || {};
		
		if ( o.constructor == Function )
			o = { complete: o };
		
		var ss = { slow: 600, fast: 200 };
		o.duration = (s && s.constructor == Number ? s : ss[s]) || 400;
	
		// Queueing
		o.oldComplete = o.complete;
		o.complete = function(){
			jQuery.dequeue(this, "fx");
			if ( o.oldComplete && o.oldComplete.constructor == Function )
				o.oldComplete.apply( this );
		};
	
		return o;
	},
	
	queue: {},
	
	dequeue: function(elem,type){
		type = type || "fx";
	
		if ( elem.queue && elem.queue[type] ) {
			// Remove self
			elem.queue[type].shift();
	
			// Get next function
			var f = elem.queue[type][0];
		
			if ( f ) f.apply( elem );
		}
	},

	/*
	 * I originally wrote fx() as a clone of moo.fx and in the process
	 * of making it small in size the code became illegible to sane
	 * people. You've been warned.
	 */
	
	fx: function( elem, options, prop ){
	
		var z = this;
	
		// The users options
		z.o = {
			duration: options.duration || 400,
			complete: options.complete,
			step: options.step
		};
	
		// The element
		z.el = elem;
	
		// The styles
		var y = z.el.style;
	
		// Simple function for setting a style value
		z.a = function(){
			if ( options.step )
				options.step.apply( elem, [ z.now ] );
 
			if ( prop == "opacity" )
				jQuery.attr(y, "opacity", z.now); // Let attr handle opacity
			else if ( parseInt(z.now) ) // My hate for IE will never die
				y[prop] = parseInt(z.now) + "px";
				
			y.display = "block";
		};
	
		// Figure out the maximum number to run to
		z.max = function(){
			return parseFloat( jQuery.css(z.el,prop) );
		};
	
		// Get the current size
		z.cur = function(){
			var r = parseFloat( jQuery.curCSS(z.el, prop) );
			return r && r > -10000 ? r : z.max();
		};
	
		// Start an animation from one number to another
		z.custom = function(from,to){
			z.startTime = (new Date()).getTime();
			z.now = from;
			z.a();
	
			z.timer = setInterval(function(){
				z.step(from, to);
			}, 13);
		};
	
		// Simple 'show' function
		z.show = function(){
			if ( !z.el.orig ) z.el.orig = {};

			// Remember where we started, so that we can go back to it later
			z.el.orig[prop] = this.cur();
			
			// Begin the animation
			z.custom(0, z.el.orig[prop]);

			// Stupid IE, look what you made me do
			if ( prop != "opacity" )
				y[prop] = "1px";
		};
	
		// Simple 'hide' function
		z.hide = function(){
			if ( !z.el.orig ) z.el.orig = {};

			// Remember where we started, so that we can go back to it later
			z.el.orig[prop] = this.cur();

			z.o.hide = true;

			// Begin the animation
			z.custom(z.el.orig[prop], 0);
		};
	
		// Remember  the overflow of the element
		if ( !z.el.oldOverflow )
			z.el.oldOverflow = jQuery.css( z.el, "overflow" );
	
		// Make sure that nothing sneaks out
		y.overflow = "hidden";
	
		// Each step of an animation
		z.step = function(firstNum, lastNum){
			var t = (new Date()).getTime();
	
			if (t > z.o.duration + z.startTime) {
				// Stop the timer
				clearInterval(z.timer);
				z.timer = null;

				z.now = lastNum;
				z.a();

				z.el.curAnim[ prop ] = true;
				
				var done = true;
				for ( var i in z.el.curAnim )
					if ( z.el.curAnim[i] !== true )
						done = false;
						
				if ( done ) {
					// Reset the overflow
					y.overflow = z.el.oldOverflow;
				
					// Hide the element if the "hide" operation was done
					if ( z.o.hide ) 
						y.display = 'none';
					
					// Reset the property, if the item has been hidden
					if ( z.o.hide ) {
						for ( var p in z.el.curAnim ) {
							if (p == "opacity")
								jQuery.attr(y, p, z.el.orig[p]);
							else
								y[ p ] = z.el.orig[p] + "px";
	
							// set its height and/or width to auto
							if ( p == 'height' || p == 'width' )
								jQuery.setAuto( z.el, p );
						}
					}
				}

				// If a callback was provided, execute it
				if( done && z.o.complete && z.o.complete.constructor == Function )
					// Execute the complete function
					z.o.complete.apply( z.el );
			} else {
				// Figure out where in the animation we are and set the number
				var p = (t - this.startTime) / z.o.duration;
				z.now = ((-Math.cos(p*Math.PI)/2) + 0.5) * (lastNum-firstNum) + firstNum;
	
				// Perform the next step of the animation
				z.a();
			}
		};
	
	}

});