custom on/off for a forum ID

[CRego3D]

Little help here

this is the code in index.php for the on/off buttons

        if ($bbuserinfo['lastvisitdate']=='Never') {
          $forum['onoff']='on';
        } else {
                                        if (isset($bbforumview[$forum['forumid']]) and $bbforumview[$forum['forumid']]>$bbuserinfo['
lastvisit']) {
                                                $userlastvisit=$bbforumview[$forum['forumid']];
                                        } else {
                                                $userlastvisit=$bbuserinfo['lastvisit'];
                                        }
          if ($userlastvisit<$forum['lastpost']) {
            $forum['onoff']='on';
          } else {
            $forum['onoff']='off';
          }
        }

        if ((!$forumperms['canpostnew'] and $showlocks) or $forum['allowposting']==0) {
          $forum['onoff'].='lock';
        }

now my question is this .. is there a way I can add an IF that says

if forumid equals number 20 (using 20 as an example) then $forum['onoff']='20on'; ... $forum['onoff']='20off';

The idea is to have custom on/off buttons to certain forums .. is this possible ?

Carlos