jCarouselLite 1.0.1 modified

/*
jCarouselLite 1.0.1
Modified by Neolot
http://neolot.com
*/
(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,beforeStart:null,afterEnd:null}, o || {});
        return this.each(function() {
            var b = false,animCss = o.vertical ? "top" : "left",sizeCss = o.vertical ? "height" : "width";
            var c = $(this),ul = $("ul", c),tLi = $("li", ul),tl = tLi.size(),v = o.visible;
            if ( $("li", ul).size() <= o.visible ) {
                o.circular = false;
            }
            $("li", ul).each(function(i) {
                var it = i + 1;
                $(this).find('a').attr('rev', 'item' + it);
            });

            if (o.circular) {
                ul.prepend(tLi.slice(tl - v - 1 + 1).clone()).append(tLi.slice(0, v).clone());
                o.start += v
            }
            var f = $("li", ul),itemLength = f.size(),curr = o.start;
            c.css("visibility", "visible");
            f.css({overflow:"hidden",float:o.vertical ? "none" : "left"});
            ul.css({margin:"0",padding:"0",position:"relative","list-style-type":"none","z-index":"1"});
            c.css({overflow:"hidden",position:"relative","z-index":"2",left:"0px"});
            var g = o.vertical ? height(f) : width(f);
            var h = g * itemLength;
            var j = g * v;
            f.css({width:f.width(),height:f.height(equalHeight(f))});
            ul.css(sizeCss, h + "px").css(animCss, -(curr * g));
            c.css(sizeCss, j + "px");
            if (o.btnPrev)$(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, a) {$(a).click(function() {return go(o.circular ? o.visible + i : i)})});
            if (o.mouseWheel && c.mousewheel)c.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 f.slice(curr).slice(0, v)}

            ;
            function go(a) {
                if (!b) {
                    if (o.beforeStart)o.beforeStart.call(this, vis());
                    if (o.circular) {
                        if (a <= o.start - v - 1) {
                            ul.css(animCss, -((itemLength - (v * 2)) * g) + "px");
                            curr = a == o.start - v - 1 ? itemLength - (v * 2) - 1 : itemLength - (v * 2) - o.scroll
                        } else if (a >= itemLength - v + 1) {
                            ul.css(animCss, -((v) * g) + "px");
                            curr = a == itemLength - v + 1 ? v + 1 : v + o.scroll
                        } else curr = a
                    } else {if (a < 0 || a > itemLength - v)return; else curr = a}
                    b = true;
                    ul.animate(animCss == "left" ? {left:-(curr * g)} : {top:-(curr * g)}, o.speed, o.easing, function() {
                        if (o.afterEnd)o.afterEnd.call(this, vis());
                        b = false
                    });
                    if (!o.circular) {
                        $(o.btnPrev + "," + o.btnNext).removeClass("disabled");
                        $((curr - o.scroll < 0 && o.btnPrev) || (curr + o.scroll > itemLength - v && o.btnNext) || []).addClass("disabled")
                    }
                }
                return false
            }
        })
    };
    function css(a, b) {return parseInt($.css(a[0], b)) || 0}

    ;
    function width(a) {return a[0].offsetWidth + css(a, 'marginLeft') + css(a, 'marginRight')}

    ;
    function height(a) {return a[0].offsetHeight + css(a, 'marginTop') + css(a, 'marginBottom')}
    function equalHeight(a){
        var tallest = 0;
        if ( a.size() > 1 ) {
            a.each(function(){
                var height = $(this).height();
                if (tallest < height) tallest = height;
            });
        } else {
            tallest = a.height();
        }
        return tallest;
    }
})(jQuery);