Filtering problems with getUsers

Hi i'm prob trying to push the boundaries here, but what i am trying to 
achieve is with getUsers obtain the groups the user is joined to so i 
can create a groups muitiple list form and have them selected in the 
list. Now I cant see any possible way to do this.

I have run into problems building a menu from getGroups, what it 
returns is a heap of fields aswell as its in a 2-dimensional array here 
is what I have to do at the moment to preformat the array to build a 
quickform list with, the preg_replace is to format the define_name from 
ADMIN_AREA to Admin Area, it would be nice if there was also a title 
group areas, groups and rights etc ..

$groups = $lu->admin->getGroups();
	
		foreach($groups as $key=>$value) {
			$group[$value['group_id']] = ucwords(strtolower(preg_replace("/_/"," 
",$value['group_define_name'])));	
		}

Now my other issue I have encountered is I would like to filter 
getRights with more than one area id ie 1,2 , so it will only contain 
the rights joined to those areas, I cant work it out :\ Lemme know.