// JavaScript Document
$.fn.infiniteCarousel = function (wrapperSelector) {
    function repeat(str, num) {
        return new Array( num + 1 ).join( str );
    }
    return this.each(function () {
        var $wrapper = $(wrapperSelector, this),
            $slider = $wrapper.find('> ul'),
            $items = $slider.find('> li'),
            $single = $items.filter(':first'),
            singleWidth = $single.outerWidth(), 
            visible = Math.ceil($wrapper.innerWidth() / singleWidth), 
            currentPage = 1,
            pages = Math.ceil($items.length / visible);            
        if (($items.length % visible) != 0) {
            $slider.append(repeat('<li class="empty" />', visible - ($items.length % visible)));
            $items = $slider.find('> li');
        }
        $items.filter(':first').before($items.slice(- visible).clone().addClass('cloned'));
        $items.filter(':last').after($items.slice(0, visible).clone().addClass('cloned'));
        $items = $slider.find('> li'); // reselect
        $wrapper.get(0).scrollLeft = singleWidth * visible;
        $('a.back', this).click(function () {
            return gotoPage(currentPage - 1);                
        });
        $('a.forward', this).click(function () {
            return gotoPage(currentPage + 1);
        });
        function gotoPage(page) {
            var dir = page < currentPage ? -1 : 1, 
                n = Math.abs(currentPage - page),
                left = singleWidth * dir * visible * n;
            $wrapper.filter(':not(:animated)').animate({
                scrollLeft : '+=' + left
            }, 500, function () {
                if (page == 0) {
                    currentPage = pages;
                    this.scrollLeft = singleWidth * visible * pages;
                } else if (page > pages) {
                    currentPage = 1;
                    this.scrollLeft = singleWidth * visible; 
                } else {
                    currentPage = page;
                }
            });                
            
            return false;
        }
        $(this).bind('goto', function (event, page) {gotoPage(page);});
    });  
};

$(function () {
    $('#scrollButtons > div').before('<a href="javascript:void(0);" class="back"><img src="images/scroll_left.png" border="0" width="19" height="20" alt="Scroll Left" title="Scroll Left" class="scrollLeft" /></a>').after('<a class="forward" href="javascript:void(0);"><img src="images/scroll_right.png" border="0"  width="19" height="20" alt="Scroll Right" title="Scroll Right" class="scrollRight" /></a>').parent().infiniteCarousel('> div');
});