Sheesh i gave ya the answer. I didn't know PHP at the time either but i figured it out. =P Learning how to research and problem solve yourself will get you farther then just waiting for someone to hand you the answer.
PHP Code:
doformheader(ereg_replace (".php", "", $PHP_SELF),"update"); //added eReg. was getting banuser.php.php - 9.15.03 by TheDPQ
Theres probably a better solution, but i didn't care to nitpick the code and findout where its already adding the extra .php. Its brute-force, but it works.
FYI i was on a private testing board. So while it didn't break, it didn't really get tested out either.