login with a php session

stud0r

On my Page thers a login script. So each user chan login for himself.
Some should have the possibility to upload pictures, which is given by "$_SESSION["upload"]".
I tried to edit the auth_zp to make this possible, but if the session is set each one can get in the admin.php, and not only the those where it's true.

I tried it a very long time, but i did't found a way to solve it.
Is there a resolution?
Sorry for my english.