Hack needed that will ask for a password when you enter a part of the forum

[MentaL]

Ok this is the deal, what we need is that when you want to enter a specific forum you need to enter a password first.

So people register, they can see certain parts of the forums, to get acces to the other part they need to enter the password, now i know we could just put people in a other usergroup, but this not how we want it, this way friends can just pass out the password to other friends.

Is this kind of hack available?

EDIT: Lol just saw the owner of this account posted too.