(function($) 
{
	$.fn.jCarouselLite = function(o)
	{
		o = $.extend(
		{
			btnPrev: 	null,
			btnNext: 	null,
			btnGo: 	 	null,
			mouseWheel: false,
			auto: 		null,
			hoverPause: false,
			speed: 		200,
			easing: 	null,
			vertical: 	false,
			circular:	true,
			visible: 	3,
			start: 		0,
			scroll: 	1,
			beforeStart: null,
			afterEnd:	 null

		}, o || {});

		return this.each(function() 
		{
			var running = false, animCss=o.vertical?"top":"left", sizeCss=o.vertical?"height":"width";
			var div 	= $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible;

			if(o.circular) 
			{
				ul.prepend(tLi.slice(tl-v+1).clone()).append(tLi.slice(0,o.scroll).clone());
				o.start += v-1;
			}

			var li = $("li", ul), itemLength = li.size(), curr = o.start;
			div.css("visibility", "visible");

			li.css({overflow: "hidden", float: o.vertical ? "none" : "left"});
			ul.css({margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1"});
			div.css({overflow: "hidden", position: "relative", "z-index": "2", left: "0px"});

			var liSize = o.vertical ? height(li) : width(li);
			var ulSize = liSize * itemLength;
			var divSize = liSize * v;

			li.css({width: li.width(), height: li.height()});
			ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));
			div.css(sizeCss, divSize+"px");

			if(o.btnPrev) 
			{
				$(o.btnPrev).click(function() 
				{
					return go(curr-o.scroll);
				});
				
				if(o.hoverPause) 
				{
					$(o.btnPrev).hover(function(){stopAuto();}, function(){startAuto();});
				}
			}
			
			if(o.btnNext) 
			{
				$(o.btnNext).click(function() 
				{
					return go(curr+o.scroll);
				});
				
				if(o.hoverPause) 
				{
					$(o.btnNext).hover(function(){stopAuto();}, function(){startAuto();});
				}
			}

			if(o.btnGo)
				$.each(o.btnGo, function(i, val) 
				{
					$(val).click(function() 
					{
						return go(o.circular ? o.visible+i : i);
					});
				});

			if(o.mouseWheel && div.mousewheel)
				div.mousewheel(function(e, d) 
				{
					return d>0 ? go(curr-o.scroll) : go(curr+o.scroll);
				});

			var autoInterval;

			function startAuto() 
			{
				stopAuto();
				autoInterval = setInterval(function() 
				{
					go(curr+o.scroll);
				}, o.auto+o.speed);
			};

			function stopAuto()
			{
				clearInterval(autoInterval);
			};
			
			if(o.auto) 
			{
				if(o.hoverPause) 
				{
					div.hover(function(){stopAuto();}, function()
					{
						startAuto();
					});
				}
				startAuto();
			};

			function vis() 
			{
				return li.slice(curr).slice(0,v);
			};

			function go(to) 
			{
				if(!running) 
				{
					if(o.beforeStart)
					{
						o.beforeStart.call(this, vis());
					}
					
					if(o.circular) 
					{
						if(to < 0) 
						{
							ul.css(animCss, -( (curr + tl) * liSize)+"px");
							curr = to + tl;
						} 
						else if(to > itemLength-v) 
						{
							ul.css(animCss, -( (curr - tl) * liSize ) + "px" );
							curr = to - tl;
						} 
						else 
						{
							curr = to;
						}
					} 
					else 
					{
						if(to < 0 || to > itemLength-v) 
						{
							return;
						}
						else 
						{
							curr = to;
						}
					}

					running = true;

					ul.animate(animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } , o.speed, o.easing, function() 
					{
						if(o.afterEnd)
						{
							o.afterEnd.call(this, vis());
						}
						running = false;
					});
					
					if(!o.circular) 
					{
						$(o.btnPrev + "," + o.btnNext).removeClass("disabled");
						$((curr-o.scroll<0 && o.btnPrev) || (curr+o.scroll > itemLength-v && o.btnNext) || [] ).addClass("disabled");
					}
				}
				return false;
			};
		});
	};

	function css(el, prop) 
	{
		return parseInt($.css(el[0], prop)) || 0;
	};
	
	function width(el) 
	{
		return  el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
	};
	
	function height(el) 
	{
		return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');
	};

})(jQuery);