This is my jquery script to sort elements on a page.

How do i reverse the order from last to first?

Code:
<script type="text/javascript">
		// When the document is ready set up our sortable with it's inherant function(s)
		$(document).ready(function() {
			$("#sortlist").sortable({
				update : function () {
					var order = $('#sortlist').sortable('serialize');
					$("#showmsg").load("sort.php?"+order);
				}
			});
		});
	</script>