Trace the login page with a socket spy app and send that data in winsock...
VB Code:
  1. 'pretend this is a button clickie sub...
  2. Winsock1.Connect "www.website.com", 80
  3. End Sub
  4.  
  5. Winsock1_Connect()
  6.    Winsock1.SendData "POST [url]www.website.com/LoginWhatever.php?[/url] HTTP/1.1" & VbCrLf _
  7. & "Host: [url]www.website.com[/url]" & VbCrLf _
  8. & "Content-Length: " & Len(LoginText) & VbCrLf & VbCrLf _
  9. & LoginText
That's just a general example, you need to see how IE logs into the page using a packet watcher.