Small image in postbit for only one usergroup. How do I do it?

[KipLarson]

<!-- Is user a member of usergroupid 15? -->
<if condition="is_member_of($vbulletin->userinfo, 15)">
	<!-- User is in the correct group, so show the image -->
	<img src="http://www.gamingvidz.com/forum/gamingvidz/misc/premium.jpg" alt="Premium Member" width="204" height="28" border="0" />
</if>

This doesn't work

<if condition="is_member_of($bbuserinfo, 15) ">
<a href="http://www.gamingvidz.com/forum/payments.php" target="_blank"><img src="http://www.gamingvidz.com/forum/gamingvidz/misc/premium.jpg" ph" alt="GV Premium Member" border="0" /></a>
</if>

This doesn't work either? Any ideas on how to fix this besides user ranks? I don't want to use those.

Please help.