/*
 *  Originally from http://www.gmarwaha.com/jquery/jcarousellite/
 *  I just modified this for use on this page somewhat. Please check out the original if you like this plugin.
 * */

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

            speed: 200,
            easing: null,

            vertical: false,
            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;

            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.btnFirst)
                $(o.btnFirst).click(function() {
                    return go(0);
                });

            if (o.btnLast)
                $(o.btnLast).click(function() {
                    return go(itemLength & o.scroll == 0 ? itemLength - o.scroll : Math.floor(itemLength / o.scroll) * o.scroll);
                });

            if (o.btnGo)
                $.each(o.btnGo, function(i, val) {
                    $(val).click(function() {
                        return go(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);

            go(o.start);

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

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

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

                    if (to < 0 || to > itemLength)
                        return false;
                    else {
                        if (to == itemLength)
                            curr = itemLength - o.scroll;
                        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;
                            }
                            );

                    $(o.btnPrev + "," + o.btnNext + "," + o.btnFirst + "," + o.btnLast).removeClass("disabled");
                    $((curr - o.scroll < 0 && o.btnPrev + "," + o.btnFirst) || (curr + o.scroll > itemLength - v && o.btnNext + "," + o.btnLast) || []).addClass("disabled");
                }
                return false;
            }
        });
    };

    function css(el, prop) {
        return parseInt($.css(el[0], prop)) || 0;
    }

    function width(el) {
        if (el.length)
            return  el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
        else
            return 0;
    }

    function height(el) {
        if (el.length)
            return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');
        else
            return 0;
    }
})(jQuery);