How to use is_member_of in template postbit

[achoo254]

I tried code in template postbit_legacy:

<vb:if condition="is_member_of($post, 5,6,7)">code here</vb:if>

It's ok, but i try:

<vb:if condition="is_member_of($post, $vboptions['select_groupid'])">

...don't work, plz help me!

p/s: i tried

is_member_of($bbuserinfo,....)

or

is_member_of($post['usergroupid'],....)

...nothing.