$.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,

        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) {
		  var lli = tLi.slice(tl-v).clone();
		  lli.css("visibility","hidden");
          ul.prepend(lli).append(tLi.slice(0,v).clone());
          o.start += v;

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

        li.css("overflow", "hidden")                        
            .css("float", o.vertical ? "none" : "left")     
            .children().css("overflow", "hidden");          

        ul.css("margin", "0")                              
            .css("padding", "0")                            
            .css("position", "relative")                    
            .css("list-style-type", "none")                 
            .css("z-index", "1");                           

        div.css("overflow", "hidden")                       
            .css("position", "relative")                    
            .css("z-index", "2")                           
            .css("left", "0px");  
		
		
                
        var liSize = o.vertical ? height(li) : width(li);   
        var ulSize = liSize * itemLength;                   
        var divSize = liSize * v;                           

        li.css("width", li.width())                         
            .css("height", li.height());                    

        ul.css(sizeCss, ulSize+"px")                        
            .css(animCss, -(curr*liSize));                  

        div.css(sizeCss, divSize+"px");                     
		lli.css("visibility","visible");
        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) {

                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');
};