Someone

<script type="text/javascript">

var tree;

window.addEvent('domready',function(){
 var stamp=Math.floor(Math.random()*100000)

	tree = new MooTreeControl({
		div: 'mytree',
		mode: 'folders',
		grid: true,
		onSelect: function(node) {
		debug.log( 'Selected Action =  Expanding:' +(node.text) + ' cPath=' + (node.id));
		//window.alert(node.id);
		}
	},{
		text: 'Categories',
		open: false
	});
	var url = 'cat-xml.php?cPath=null';
        new Ajax(url, {
	method: 'get',
	evalScripts: true,
	update: $('loadXML')
	}).request();
        (tree.selected||tree.root).load('cache/null.xml?' + stamp )
});
</script>