Something

/*-------------------
# Update the last seen
#-------------------*/
if($_CFG['log_last_action'] == '1'){
        //are we a user or guest?
        if($u['gid'] != $_CFG['class_guest']){
                cmysql_query('UPDATE '.SQL_PREFIX.'users SET last_seen = \''.time().'\', last_seen_where = \''.$u['last_seen_where'].'\' WHERE uid = \''.$u['uid'].'\'');
        }/*else{   
                cmysql_query('INSERT INTO '.SQL_PREFIX.'guest_sessions (ip, last_seen, last_seen_where) VALUES (\''.$_SERVER['REMOTE_ADDR'].'\', \''.time().'\', \''.$u['last_seen_where'].'\')');
        }*/
}