How to Pass the Calling User to an Aspx Page from Sitemap in CRM 2011
First, you need to create a simple HTML file and put the following codes in that page. Add the HTML file into the web resource. Call that file from your Sitemap. By the way, don’t forget to redirect to your aspx page in the HTML file. 🙂
<HTML><HEAD><TITLE></TITLE></HEAD>
<BODY onload=redirectAspxPage(); contentEditable=true>
<SCRIPT type=text/javascript src=”../ClientGlobalContext.js.aspx”></SCRIPT>
<SCRIPT type=text/javascript>
function redirectAspxPage() {
var userid = window.parent.Xrm.Page.context.getUserId();
window.location.href = “http://YOUR_URL/YOUR_PAGE.aspx?userid= ” + userid;
}
</SCRIPT>
</BODY></HTML>
deedodee 
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That is a very good tip especially to those new to the blogosphere.
Simple but very accurate information… Thanks
for sharing this one. A must read post!