Lightbox .php/.html

[flyfreak]

Hey

I´v got a problem, the link in the menu when a user is logged in is rong. It is lightbox.htm - and it need to be lightbox.php - but were can i edit the menu=

[flyfreak]

I dont think it has anything to do with google - i just need to owerwrithe the menu fro lightbox.htm  to lightbox.php