Tree has unlimmited level count. Each new level loaded from asp script.
<div id="treeboxbox_tree" style="width:200;height:200"></div>
<script>
tree=new dhtmlXTreeObject("treeboxbox_tree","100%","100%",0);
tree.setImagePath("../imgs/");
//link tree to asp script
tree.setXMLAutoLoading("xml.php");
//load first level of tree
tree.loadXML("xml.asp?id=0");
</script>