If display group template conditional

[Reizar]

Hi,

I've been using this conditional in my templates:

<vb:if condition="is_member_of($post, 56)">

To make some customizations in my postbit. However I notice that utilizes someone's primary usergroup. (I'm using it to show a specific image depending on the usergroup )

Is there a similar conditional that uses whatever their display group is rather then primary usergroup?

Thanks