<div id="treeboxbox_tree" style="width:200;height:200"></div>
<script>
 
            tree=new dhtmlXTreeObject("treeboxbox_tree","100%","100%",0);
            tree.setImagePath("../imgs/");
            //enable item highlighting
            tree.enableHighlighting(true);
            tree.loadXML("tree.xml");
            
            ....
            //show item sign
            tree.showItemSign(id,true);
            //hide item sign
            tree.showItemSign(id,false);</script>