Preventing user from going back

[Grunt]

I know it is not possible to disable the back button or anything, but I dont want the user to be able to go back after hitting the back button. However, it is not working. It does not work at all in mozilla, and I get wierd problems in IE. Here is my code:


This is on the main page load

Response.Buffer = True
        Response.ExpiresAbsolute = Now().Subtract(New TimeSpan(1, 0, 0, 0))
        Response.Expires = 0
        Response.CacheControl = "no-cache"

        If Len(Session("FirstTimeToPage")) > 0 Then
            'The user has come back to this page after having visited
            'it... wipe out the session variable and redirect them back
            'to the login page
            Session.Item("FirstTimeToPage") = ""
            Response.Redirect("LoginForm.aspx")
            Response.End()
        End If

this is when logout is clicked.

'close the mySQL connection
        myConnection.Close()

        Session.Item("LogState") = "NO"

        'transfer the user to the logout page
        Server.Transfer("LogOut.aspx")