(function($) {
$.fn.jCarouselLite = function(o) {
	o = $.extend({
		btnPrev: null,
		btnNext: null,
		btnGo: null,
		mouseWheel: false,
		auto: null,

		speed: 200,
		easing: null,

		vertical: false,
		circular: true,
		visible: 3,
		start: 0,
		scroll: 1,
		pauseOnHover: false,

		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, paused=0;
		
		if(o.circular) {
			ul.prepend(tLi.slice(tl-v-1+1).clone())
			  .append(tLi.slice(0,v).clone());
			o.start += v;
		}
		
		o.pauseOnHover ? ul.hover(function (){paused=1}, function (){paused=0}) : "";
		
		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.btnNext)
			$(o.btnNext).click(function() {
				return go(curr+o.scroll);
			});

		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);
			});

		if(o.auto)
			setInterval(function() {
				go(curr+o.scroll);
			}, o.auto+o.speed);

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

		function go(to) {
			if(!running && !paused) {

				if(o.beforeStart)
					o.beforeStart.call(this, vis());

				if(o.circular) {
					if(to<=o.start-v-1) {
						ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");
						curr = to==o.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll;
					} else if(to>=itemLength-v+1) {
						ul.css(animCss, -( (v) * liSize ) + "px" );
						curr = to==itemLength-v+1 ? v+1 : v+o.scroll;
					} 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);