Write Windows Username Into Input Field - Important

I need a javascript or VB code to display the visitors windows username in a input field as a default value.

I was wondering if this little VB script might help:
      <script language="VBScript">
         Set WshNetwork = WScript.CreateObject("WScript.Network")
         WScript.Echo "Domain = " & WshNetwork.UserDomain
         WScript.Echo "Computer Name = " & WshNetwork.ComputerName
         WScript.Echo "User Name = " & WshNetwork.UserName
      </script>

Is there some way to display WshNetwork.UserName as a value in an input?

Thanks

DugAdmin