Restricted forum problem (involving the Search)

[mindbuster]

Hi.

I have placed this piece of code on line 63 in forumdisplay.php

PHP Code:

if ($bbuserinfo[posts]<5 AND $forumid==19) {show_nopermission();exit;} 


to deny access for forum guests and members with less than 5 posts.
It works fine except that if a guest uses the search function, threads in that forum shows up too and they can just click one of the search results to get access to the forum.

How do i prevent that?