(function($) {
$.fn.infiniteCarousel = 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'),
            
            singleWidth = $single.outerWidth(), 
            visible = Math.ceil($wrapper.innerWidth() / singleWidth), // note: doesn't include padding or border
            currentPage = 1,
            pages = Math.ceil($items.length / visible);

        // 1. Pad so that 'visible' number will always be seen, otherwise create empty items
        if (($items.length % visible) != 0) {
            $slider.append(repeat('<li class="empty" />', visible - ($items.length % visible)));
            $items = $slider.find('> li');
        }

        // 2. Top and tail the list with 'visible' number of items, top has the last section, and tail has the first
        $items.filter(':first').before($items.slice(-2, -1).clone().addClass('cloned')).before($items.slice(- visible).clone().addClass('cloned'));
        $items.filter(':last').after($items.slice(1, visible+1).clone().addClass('cloned')).after($items.slice(0, visible).clone().addClass('cloned'));
        $items = $slider.find('> li'); // reselect
        
        // 3. Set the left position to the first 'real' item
        $slider.css('left', -1*singleWidth * visible);
        
        // 4. paging function
        function gotoPage(page) {
            var dir = page < currentPage ? -1 : 1,
                n = Math.abs(currentPage - page),
                left = singleWidth * dir * visible * n;
            
            $slider.filter(':not(:animated)').animate({
                left : '-=' + left
            }, 500, function () {
                if (page <= 0) {
                    $slider.css('left', -1*singleWidth * visible * (pages+page));
                    page = pages;
                } else if (page > pages) {
                	$slider.css('left', -1*singleWidth * visible);
                    // reset back to start position
                    page = 1;
                } 

                currentPage = page;
				$(this).trigger('changePage', currentPage);
            });                
            
            return false;
        }
        
        function movePage( dir ) {
        	gotoPage(currentPage + dir);
        }
        
        // create a public interface to move to a specific page
        $(this).bind('goto', function (event, page) {
            gotoPage(page);
        });
        $(this).bind('move', function (event, dir) {
            movePage(dir);
        });
    });  
};
})(jQuery);