Modifying Infinate Carousel active child
<p>I am trying to adapt <a href="http://web.enavu.com/demos/carousel.html" rel="nofollow">Infinate Carousel</a> for a rotating services display but can't work out how to add an active class to the currently centered item.</p>

<p>The carousel moves the <code>:first</code> and <code>:last</code> items within the list so has a continuous loop.</p>

<p>Naively I hoped that <code>
        $('#carousel_ul li:first').addClass('active');
        $('#carousel_ul li:not(:first)').removeClass('active');</code> would do it but it did not work as planned, it appeared to only affect the initial <code>:first</code> and <code>:last</code> children.</p>

<h2>jQuery</h2>

<p>$('#carousel_ul li:first').before($('#carousel_ul li:last')); </p>

<pre><code>    //when user clicks the image for sliding right        
    $('#right_scroll img').click(function(){

        //get the width of the items ( i like making the jquery part dynamic, so if you change the width in the css you won't have o change it here too ) '
        var item_width = $('#carousel_ul li').outerWidth() + 10;

        //calculae the new left indent of the unordered list
        var left_indent = parseInt($('#carousel_ul').css('left')) - item_width;

        //make the sliding effect using jquery's anumate function '
        $('#carousel_ul:not(:animated)').animate({'left' : left_indent},500,function(){    

            //get the first list item and put it after the last list item (that's how the infinite effects is made) '
            $('#carousel_ul li:last').after($('#carousel_ul li:first')); 

            //and get the left indent to the default -210px
            $('#carousel_ul').css({'left' : '-222px'});
        }); 
    });

    //when user clicks the image for sliding left
    $('#left_scroll img').click(function(){

        var item_width = $('#carousel_ul li').outerWidth() + 10;

        /* same as for sliding right except that it's current left indent + the item width (for the sliding right it's - item_width) */
        var left_indent = parseInt($('#carousel_ul').css('left')) + item_width;

        $('#carousel_ul:not(:animated)').animate({'left' : left_indent},500,function(){    

        /* when sliding to left we are moving the last item before the first list item */            
        $('#carousel_ul li:first').before($('#carousel_ul li:last')); 

        /* and again, when we make that change we are setting the left indent of our unordered list to the default -210px */
        $('#carousel_ul').css({'left' : '-222px'});
        });


    });
</code></pre>
