function slider() {
	var html = "<li>" + $("#viewport ul").children().html() + "</li>";
	
	$("#viewport ul").children().first()
		.animate({marginLeft: "-720px"}, 2000, function(){ $("#viewport ul").children().first().remove() });
		
	$("#viewport ul").append(html);
}

$(function() {
	setInterval("slider()", 5000);
});