[kh99]

What you could do in that case is set a variable in the plugin to true, then in the template condition just check the variable. In fact you could use the $show[] array that exists already, as long as you choose a name that you're sure would be unique.

For example, in the plugin you could do something like:

$MyUsergroups = array(1, 3, 5, 57);
if (is_member_of($bbuserinfo, $MyUsergroups))
{
    ...some code..
    $show['some_unique_name'] = true;
    ... more code
}

then in the template

<vb:if condition="$show['some_unique_name']">
// show something
</vb:if>