how to enable script for usergroup only

[snoop1979]

hi, i need to create some kind of IF for the postbit_attachment so that way only vip group can download attachments.
this is the code on the postbit_attachmentsf

PHP Code:

<tr>
    <td><img class="inlineimg" src="$stylevar[imgdir_attach]/$attachment[attachmentextension].gif" alt="<phrase 1="$attachment[attachmentextension]">$vbphrase[file_type_x]</phrase>" width="16" height="16" border="0" style="vertical-align:baseline" /></td>
    <td><a href="attachment.php?$session[sessionurl]attachmentid=$attachment[attachmentid]&amp;d=$attachment[dateline]"<if condition="$show['newwindow']"> target="_blank"</if>>$attachment[filename]</a> ($attachment[filesize]<if condition="$show['views']">, <phrase 1="$attachment[counter]">$vbphrase[x_views]</phrase></if>)</td>
</tr> 


so i need to make this code workable for a specific groupid, how can i do this?

--------------- Added [DATE]1198187733[/DATE] at [TIME]1198187733[/TIME] ---------------

i found this

<if condition="$bbuserinfo[usergroupid] == 6">

works perfect but is there a way to make it multi usergroup? i hav tried put 6 7 10 or 6, 7, 10 and doesnt work

[Opserty]

<if condition="is_member_of($bbuserinfo, 6, 7, 10)">
    Display Code
</if>