Admin - how to get the groups for a user?

Hi, I'm using the Perm_Medium admin class and trying to use getGroups to 
come up with the groups for a user, but I'm a little stumped.

I am basically trying to create an "Edit user" type page for admins, and 
I want to let them choose which group the user belongs to.  I need to 
show which group the user currently belongs to, which is what I am 
having trouble with.    Here is what I am looking at:

                               // Get group names/ids from DB for dropdown
                               $groups = $admin->perm->getGroups();

                              // Get the group that this user belongs 
to  (doesn't work)
                               $filters = array(
                                               'perm_user_id' => $id
                               );
                                $usergroup = 
$admin->perm->getGroups($filters);

I realize that the user and group mapping are in the separate table 
usergroups (not groups), but I am wondering how I can filter on that 
information? 


thanks,
-stacy

-- 
Stacy Johnson
Ignite Analytics Corporation
[email protected]
m. 206-354-5591