window.addEvent('domready',function() {
	/* settings */
	var list = $('upcoming-showdates').getFirst('ul');
	var items = list.getElements('li');
	var showDuration = 3000;
	var scrollDuration = 500;
	var index = 0;
	var height = 190;
	/* action func */
	var move = function() {
		list.set('tween',{
			duration: scrollDuration,
			onComplete: function() {
				if(index == items.length - 1) {
					index = 0;
					list.scrollTo(0,0);
				} else {
				    index++;
				}
			}
		}).tween('top',0 - (index * height));
	};
	/* go! */
	window.addEvent('load',function() {		
		move.periodical(showDuration);
	});
});