$this_user = $db->query_first("SELECT username FROM ".TABLE_PREFIX."user WHERE usergroupid IN (16,103,104,105,106) OR FIND_IN_SET(16,membergroupids) OR FIND_IN_SET(103,membergroupids) OR FIND_IN_SET(104,membergroupids) OR FIND_IN_SET(105,membergroupids) OR FIND_IN_SET(106,membergroupids) ORDER BY RAND()");