IF Conditions

[utahraves]

I've tried using a IF Condition in my version 4 to block something out to unregistered users.
I use:

<vb:if condition="$post['usergroupid'] != 1">
BLOCKEDOUTINFOHERE
</vb:if>

Can not get this for the life of me to work... I was looking for a vb4 updated list of if conditions

Should I be using...

<vb:if condition="$is_member_of($bbuserinfo,1)">

<vb:else />
BLOCKEDOUTINFOHERE
</vb:if>

I'm at a complete loss of what to do here... I seem to be blanking out what should be done. Thanks in advance for any help.