﻿
		$.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(- 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);
		        });
		        
		        // create a public interface to move to a specific page
		        $(this).bind('goto', function (event, page) {
		            gotoPage(page);
		        });
		    });  
		};
		

