Reference VBScript Variable

This is my VBScript function:

<script language="JavaScript" type="text/JavaScript">
Dim UN
Set objNet = CreateObject("WScript.NetWork")
Set objUser = GetObject("WinNT://my domain/" & objNet.UserName )
UN = objNet.UserName & " (" & objUser.FullName & ")"
</script>

How can I reference the VBScript Variable UN in my ASP code? <%=UN%> won't work because VBScript is on the client side and ASP is on the server side. If I have to post it on one page and read it on another, how do I do that?