(function($) {  
totalLiLength=0;
isFirstTime=true;

// Compliant with jquery.noConflict()
$.fn.jCarouselLite = function(o) {	
	var rand_no = Math.random();	
    o = $.extend({
        btnPrev: null,
        btnNext: null,
        btnGo: null,
        mouseWheel: false,
        auto: null,

        speed: 200,
        easing: null,

        vertical: false,
        circular: true,
        zoom: false,
        marker: true,       
        visible: 3,
        start: 0,
        scroll: 1,
		firstTime: false,

        beforeStart: null,
        afterEnd: null
    }, o || {});

    return this.each(function() {// Returns the element collection. Chainable.		
		
        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(tl<4){
				  return
	    }

        if(o.circular&&totalLiLength==0) { 
            ul.prepend(tLi.slice(tl-v-1+1).clone())
              .append(tLi.slice(0,v).clone());
			  totalLiLength=tl;
			   o.start += v; 
        }	
		else{
			resetInt();
		}	
        
        var li = $("li", ul), itemLength = li.size()


		if(isFirstTime)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"});
        //div.css({position: "relative", "z-index": "2", left: "0px"});		

        liSize = o.vertical ? height(li) : width(li);    // Full li size(incl margin)-Used for animation              	
        ulSize = liSize * itemLength;                   // size of full ul(total length, not just for the visible items)
        divSize = liSize * v;                           // size of entire div(total length for just the visible items)

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

        div.css(sizeCss, divSize+"px");                     // Width of the DIV. length of visible images
		
		if(isFirstTime){
			if(o.btnPrev)
				$(o.btnPrev).click(function() {
					resetInt()
					return go(curr-o.scroll);
				});
	
			if(o.btnNext)
				$(o.btnNext).click(function() {
					resetInt();				
					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){
				
				setInt()
			}
				
		}
		
		isFirstTime=false;
	
		
		function setInt(){

            idSI=setInterval(function() {
                go(curr+o.scroll);
            }, o.auto+o.speed);					
			
		}
		function resetInt(){
			    
			clearInterval(idSI);			
			setInt();		
		}
		
        function vis() {
            return li.slice(curr).slice(0,v);
        };

        function go(to) {	
		
            if(!running) {
                if(o.beforeStart)
                    o.beforeStart.call(this, vis());

                    if(to<=o.start-v-1) { // If first, then goto last          
                        var moveTo = ((itemLength-(v*2)+(o.scroll+to)))   
                        ul.css(animCss, -(moveTo * liSize) + "px");
                        curr=moveTo-o.scroll;
                        
                    } else if(to>=itemLength-v+1) { // If last, then goto first    
                        ul.css(animCss, -((v+1+(to-(itemLength-v+1)-o.scroll)) * liSize) + "px");
                        curr = v+1+(to-(itemLength-v+1));                        
                    } 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;
                    }
                );
                // Disable buttons when the carousel reaches the last/first, and enable when not
                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);