I'm trying to create a simple web browser/pinger that loads pages from my web site to keep the app on the web site running.

Code:
    Private Sub timer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles timer.Tick
        If wb.Tag = "a" Then
            wb.Navigate("www.16tracks.com")
            wb.Tag = "b"
        Else
            wb.Navigate("www.16tracks.com/contact-16-tracks/")
            wb.Tag = "a"
        End If
    End Sub
When I run the program, a page loads and then I get errors.
Name:  errors.JPG
Views: 230
Size:  110.4 KB

Is this a problem with my program or the app on my web site?

Any better solutions for keeping my web app alive?
gs