Javascript - load page based on Username

I have 2 groups of people; group 1 of about 6 people need access to a specific internal webpage (I'll do if statements for each of them).  So when a button is clicked, I'd like group 1 to reload the original page after an alert.  Group 2 - load the new page.

Here's what I've got so far:

<scripttype="text/javascript">Function ldwrkPage90 (){varWinNetwork=newActiveXObject("WScript.Network");if(WinNetwork.UserName="membergrp2"){
        window.open("test.html");}
    elseif (WinNetwork.Username="membergrp1"){

    alert("You do not have access to this page.");
    location.reload();}}</script>


BUTTON...onclick="ldwrkPage90()"

It doesn't work.  I've tested the WinNetwork.UserName with an alert and it does retrieve the right name so I think I might have an issue with syntax. 

Help!!!  I hope I'm in the right forumn.  I can't use server side code so please don't tell me to use ASP.  thx.

Excel Worker Bee