$.fn.infiniteCarousel = function () {

    function repeat(str, num) {
        return new Array( num + 1 ).join( str );
    }
	
	var thumb_index = $(".carousel li").length;
	$('#spotlight').append('<ul id="carousel_thumbs"></ul><div class="clear"></div>')
	for(i=0;i<thumb_index;i++)
		{
			c = i + 1;
			bgpos = i*35;
			$('#carousel_thumbs').append('<li><a href="#page'+ c +'" title="jump to page '+ c +'" style="background-position:-'+bgpos+'px 0"><span style="background-position:-'+bgpos+'px 100%">'+ c +'</span></a></ul>');
		}
		
	$('#carousel_thumbs li a span').css('opacity', 0);
	$('#carousel_thumbs li:first').addClass('active').find('span').css('opacity', 1);
  
    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(- visible).clone().addClass('cloned'));
        $items.filter(':last').after($items.slice(0, visible).clone().addClass('cloned'));
        $items = $slider.find('> li'); // reselect
        
        // 3. Set the left position to the first 'real' item
        $wrapper.scrollLeft(singleWidth * visible);
        
        // 4. paging function
        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) {
                    $wrapper.scrollLeft(singleWidth * visible * pages);
                    page = pages;
                } else if (page > pages) {
                    $wrapper.scrollLeft(singleWidth * visible);
                    // reset back to start position
                    page = 1;
                } 

                currentPage = page;
            });                
            
            return false;
        }
        
        $wrapper.after('<a class="arrow back">&lt;</a><a class="arrow forward">&gt;</a>');
        
        // 5. Bind to the forward and back buttons
        $('a.back', this).click(function () {
            return gotoPage(currentPage - 1);                
        });
        
        $('a.forward', this).click(function () {
            return gotoPage(currentPage + 1);
        });
        
		$('#carousel_thumbs li').click(function () {
				var page = $('#carousel_thumbs li').index(this)+1;
				$('#carousel_thumbs li.active').removeClass('active').find('span').fadeTo('fast', 0);
				$(this).addClass('active').find('span').fadeTo('fast', 1);
            	return gotoPage(page);
        });
		 $('#carousel_thumbs li').hover(
		  function () {
			$(this).not('.active').find('span').stop().fadeTo('fast', 0.8);
		  }, 
		  function () {
			$(this).not('.active').find('span').stop().fadeTo('fast', 0);
		  }
		);

	
		
    });  
};

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