In your header simply
Delete this :-
<a href="usercp.php?s=$session[sessionhash]"><img src="{imagesfolder}/top_profile.gif" alt="Here you can view your subscribed threads, work with private messages and edit your profile and preferences" border="0"></a>
<a href="register.php?s=$session[sessionhash]&action=signup"><img src="{imagesfolder}/top_register.gif" alt="Registration is free!" border="0"></a>
And replace it with :
$register_or_controlpanel
Tried and tested and works fine and the php edit is hardly brain surgery now is it
HM