$.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>');
		
		$('a.back').attr('title', 'Scroll through services');
		$('a.forward').attr('title', 'Scroll through services');
        
        // 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);
        });
		
		/*
		
			CUSTOMIZATIONS - Michael Scribellito
			
			add arrow key functionality, mousewheel, and autoscroll
			
			arrowkeys:
				37 -> left
				38 -> up
				39 -> right
				40 -> down
		
		*/
		
		// autoscroll	
		
		var slider_interval = window.setInterval(function() {
			gotoPage(currentPage + 1); 
		}, 8000);
		
		function reset_interval() {
			clearInterval(slider_interval);
			slider_interval = window.setInterval(function() {
				gotoPage(currentPage + 1); 
			}, 8000);
		}
		
		// arrowkeys
		
		$(document).keydown(function(e){
			reset_interval();
			if (e.keyCode == 37 || e.keyCode == 40)
				return gotoPage(currentPage - 1);  
		});
		
		$(document).keydown(function(e){
			reset_interval();
			if (e.keyCode == 39 || e.keyCode == 38)
				return gotoPage(currentPage + 1);  
		});
		
		// mousewheel
		
		$('.infiniteCarousel').bind('mousewheel', function(event, delta) {
			reset_interval();
			switch(delta) {
				case 1:
					return gotoPage(currentPage + 1); 
				break;
				case -1:
					return gotoPage(currentPage - 1);  
				break;
			}
		});	

		
    });  
};