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AttachEvent won't link to webpage

I'm using the following code to create a simple XML based site map; here is the code;

    <script>
            tree=new dhtmlXTreeObject("treeboxbox_tree","100%","100%",0);            
            tree.setSkin('dhx_skyblue');
            tree.setImagePath("../Sitemap/common/images/");
            tree.enableDragAndDrop(0);
            tree.enableTreeLines(false);
            tree.setImageArrays("plus","","","","plus.gif");
            tree.setImageArrays("minus","","","","minus.gif");
            tree.setStdImages("book.gif","books_open.gif","books_close.gif");    
            tree.setXMLAutoLoading("../Sitemap/MenuTree.xml");
            tree.loadXML("../Sitemap/MenuTree.xml");
    </script>
    
    <script>//tree.attachEvent("onClick",function(id){document.location.href=tree.getUserData(id,"url");return true;});</script>

Here is a snippet of the XML. Only the first line is formatted as a link;

<?xml version='1.0' encoding='iso-8859-1'?>
<tree id="0">
<item text="RSOPS Website" id="root" open="1" call="1" select="1">
    <item text="Home" id="Homepage" ><userdata name="url">http://www.rsoperations.com/index.php</userdata></item>
    <item text="Projects" id="pr" open="1" >
        <item text="Florida" id="pr_1" />
        <item text="Philippines" id="pr_2" />
        <item text="South Seas" id="pr_3" />
    </item>

Here is a link to a live page;

http://www.rsoperations.com/SiteMap/SiteMapInclude.html

I have to comment out the attachEvent function or the tree will load and then immediately go to the "PAGE NOT FOUND MESSAGE" and you cannot see the source code.

Please Help!