Reloading
<![CDATA[
<div id="treeboxbox_tree" style="width:200;height:200"></div>
<script>
tree=new dhtmlXTreeObject("treeboxbox_tree","100%","100%",0);
tree.setImagePath("../imgs/");
tree.loadXML("tree.xml")
...
//delete existig tree
tree.deleteChildItems(0);
//load new tree
tree.loadXML('tree.xml');
</script>
]]>