Easy login in a single page

Hi there!

I'd like to set up a page that unregistered users can access.
This page contains the necessary fields to log in.
When a user logs in, he stays on the same page but the PHP code must tell whether he has logged or not and display a welcome back message if so.

I've tried to mix contents from login.php & example.php but didn't succeed yet.
Is there an easy way to do that with this class?

Thanks,

Please check the link on my website to the support forum at webdigity