MyBB Community Forums

I want only two categories are shown at the index.php. Later this should be an alternative entrance file for special users. Something like a tab of labroccas tabbed menu but an independet one. Hope you know what i mean.

The fid of the two categories which should be displayed are 61 and 64 with several forums and subforums.

I tried to change the code like this but it didn't worked:

if($mybb->user['uid'] == 0)
{
	// Build a forum cache.
	$query = $db->query("
		SELECT *
		FROM ".TABLE_PREFIX."forums
		WHERE active != 0 AND fid IN(61,64)
		ORDER BY pid, disporder
	");
	
	$forumsread = unserialize($mybb->cookies['mybb']['forumread']);
}
else
{
	// Build a forum cache.
	$query = $db->query("
		SELECT f.*, fr.dateline AS lastread
		FROM ".TABLE_PREFIX."forums f
		LEFT JOIN ".TABLE_PREFIX."forumsread fr ON (fr.fid=f.fid AND fr.uid='{$mybb->user['uid']}')
		WHERE f.active != 0 AND f.fid IN(61,64)
		ORDER BY pid, disporder
	");
}

So what i have to change? I get only the categories displayed, but not the forums of it, even the subforums aren't displayed.
This way works, but isn't a handy one, because i have to enter all fids of every subforum manually:

/*Radio GSG*/
if($mybb->user['uid'] == 0)
{
	// Build a forum cache.
	$query = $db->query("
		SELECT *
		FROM ".TABLE_PREFIX."forums
		WHERE active != 0 AND fid IN (61,67,94,64,86,95,85,77,84,97,89)
		ORDER BY pid, disporder
	");
	
	$forumsread = unserialize($mybb->cookies['mybb']['forumread']);
}
else
{
	// Build a forum cache.
	$query = $db->query("
		SELECT f.*, fr.dateline AS lastread
		FROM ".TABLE_PREFIX."forums f
		LEFT JOIN ".TABLE_PREFIX."forumsread fr ON (fr.fid=f.fid AND fr.uid='{$mybb->user['uid']}')
		WHERE f.active != 0 AND f.fid IN (61,67,94,64,86,95,85,77,84,97,89)
		ORDER BY pid, disporder
	");
}

So how can i change the code to work with only two given categorie fids? Hope you can help me.