I have a login form that opens in a DMXzone Lightbox, and after submission redirects to a secure landing page. I followed the FAQ "Close Lightbox when form is submitted" and put a target = "_top" in the form tag.
This works fine except when an incorrect username or password is entered. The login form with a server validation message I setup does not reload in the Lightbox, but in a normal page.

How does one get it to stay in the Lightbox until the form is successfully submitted?

I tried using this code snippet from the FAQ, but not sure where to put it:
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if (count($_POST) > 0) {
echo "<script> top.location = top.location; </script>";
exit;
}
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Cheers
Dave

Any suggestions folks?