// FUDforum releases before 2.6.0 doesn't have a 'users_opt' field.
try {
	// Try with 'users_opt'.
	$auth = q_singleval("SELECT id FROM ".$DBHOST_TBL_PREFIX."users WHERE login='".addslashes($_POST['login'])."' AND passwd='".md5($_POST['passwd'])."' AND (users_opt & 1048576) > 0");
} catch (Exception $e) {
	// It didn't work, try without 'users_opt'.
	$auth = q_singleval("SELECT id FROM ".$DBHOST_TBL_PREFIX."users WHERE login='".addslashes($_POST['login'])."' AND passwd='".md5($_POST['passwd'])."' AND is_mod='A'");
}