heres a little something... 
VB Code:
'timer interval is 5000 here, which is 5 seconds
Dim MyTimer as New System.Timers.Timer(5000)
'In Form Load, add this
AddHandler MyTimer.Elapsed, AddressOf TimerFired
'Add this sub to handle the event
'Fires after each Timer interval, in this case, every 5 seconds
Public Sub TimerFired(ByVal sender As Object, _
ByVal e As System.Timers.ElapsedEventArgs)
wWeb.Refresh
End Sub
'Remember to start the timer when you want with the following code...
MyTimer.Enabled = True
MyTimer.Start()
'To disable and stop the timer, change the enabled property
MyTimer.Enabled = False