External Login/Register

Hey,

we realized our login with an iframe to the login.php and the redirection to our main.php where

<script type="text/javascript">
if (window != top) {
  top.location.replace("main.php"); // Weiterleiten
}
</script>

checks to set the content to the main window. Works perfekt.

But when we try to iframe the register.php then following String appears:

"The requested content cannot be loaded.
Please try again later."

Any Idea?

MfG Topo