[TECK]

open showthread.php. find the code:

PHP Code:

$forum=getforuminfo($thread['forumid']); 


below this add:

PHP Code:

if ($bbuserinfo[userid]==0 and ($thread['forumid']!=xx or $thread['forumid']!=xx)) {
  eval("\$adpopup .= \"".gettemplate('ad_popup')."\";");
} 


note: the $forum=... code shows 2 times in showthread.php file. do it twice.

let me know if it worked.

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