function scrollNext() {
    var noItems = $$('#tweetbar li').length;
    var active = $$('#tweetbar li.active').getFirst();
    var prevItem = null;
    var nextItem = null;
    var index = 0;
    
    $$('#tweetbar li').each(function(li){
        if(li.hasClass('active')) {
            if((index + 1) == noItems){
                prevItem = li;
                nextItem = $$('#tweetbar li')[0];
            } else {
                prevItem = li;
                nextItem = $$('#tweetbar li')[index+1];
            }
        } else {
            index++;
        }
    });
    
    prevItem.removeClass('active');
    nextItem.addClass('active');            
    prevItem.dissolve();        
    nextItem.reveal();
}

window.addEvent('domready', function(){
    window.setInterval("scrollNext()", 5000);
});