$.fn.projectencarousel = function () {
 
    function repeat(str, num) {
        return new Array( num + 1 ).join( str );
    }
  
    return this.each(function () {
        var $wrapper = $('> div', this).css('overflow', 'hidden'),
            $slider = $wrapper.find('> ul'),
            $items = $slider.find('> li'),
            $single = $items.filter(':first'),
            
            singleHeight = 58,
            visible = 4
            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');
        
        $wrapper.scrollTop(singleHeight * visible);
        
        function gotoPage(page) {
            var dir = page < currentPage ? -1 : 1,
                n = Math.abs(currentPage - page),
                top = singleHeight * dir * visible * n;
            
            $wrapper.filter(':not(:animated)').animate({
                scrollTop : '+=' + top
            }, 500, function () {
                if (page == 0) {
                    $wrapper.scrollTop(singleHeight * visible * pages);
                    page = pages;
                } else if (page > pages) {
                    $wrapper.scrollTop(singleHeight * visible);
                    page = 1;
                } 
 
                currentPage = page;
            });                
            
            return false;
        }
        
        $wrapper.after('<a class="arrow back">&lt;</a><a class="arrow forward">&gt;</a>');

        $('a.back', this).click(function () {
            return gotoPage(currentPage - 1);                
        });
        
        $('a.forward', this).click(function () {
            return gotoPage(currentPage + 1);
        });

        $(this).bind('goto', function (event, page) {
            gotoPage(page);
        });
    });  
};
 
$(document).ready(function () {
  $('.projectencarousel').projectencarousel();
});