$.fn.carousel = function () {
    function repeat(str, num) {
        return new Array( num + 1 ).join( str );
    }

    return this.each(function () {
        var $wrapper = $(this).css('overflow', 'hidden');
        var $slider = $wrapper;

        var $items = $slider.find('li');
        var $single = $items.filter(':first');

        var singleWidth = $single.outerWidth();
        var visible = 1;
        var currentPage = 1;
        var pages = Math.ceil($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');

        $wrapper.scrollLeft(singleWidth * visible);

        function gotoPage(page) {
            var dir = page < currentPage ? -1 : 1,
                n = Math.abs(currentPage - page),
                left = Math.round((singleWidth * dir * visible * n));

            $wrapper.filter(':not(:animated)').animate({
                scrollLeft : '+=' + left
            }, 1000, function () {
                if (page == 0) {
                    $wrapper.scrollLeft(singleWidth * visible * pages);
                    page = pages;
                } else if (page > pages) {
                    $wrapper.scrollLeft(singleWidth * visible);
                    page = 1;
                }

                $('.carousel_nav li.current').removeClass('current');
                $($('.carousel_nav li').get(page)).addClass('current');

                currentPage = page;
            });

            return false;
        }

        $('.arrow_right').click(function(e) {
            gotoPage(currentPage + 1);
            e.stopPropagation();
            return false;
        });

        $('.arrow_left').click(function(e) {
            gotoPage(currentPage - 1);
            e.stopPropagation();
            return false;
        });

        $('.carousel_nav li').click(function() {
            if($(this).hasClass('arrow_left') || $(this).hasClass('arrow_right')) {
                return;
            }

            gotoPage($(this).parents('ul').children('li').index($(this).get(0)));
        });
    });
};

$(document).ready(function () {
  $('.carousel_inner').carousel();
});