Please provide a little more detail about what webform1 and webform2 do. Instead of relying on cleint side scripting being enabled, you can have your aspx page post to itself and do your checking in webform1

If Page.IsPostBack Then
     Dim needToRedierect as Boolean = False
            ' Put code here to check to see if you need to reditrect   
      If needToRedirect Then
            response.redirect("webform2.aspx")
      End If

End If