how to check if an user is in my buddygroup "trust" ?

hi guys,

is there a possibility to check that an user is in my trust buddy group?

i work with this snipped to check that he is in my buddylist, but how to check the group? ...

if (@in_array($user->uid, array_keys(buddylist_get_buddies($account->uid))) && user_access('maintain buddy list'))
{  
code...  
} 
else 
{ 
code...
 } 

greets

Lausch