$multi_kontoida=sql::$db->query("SELECT kontoid FROM "._VMS_."_multi_konten WHERE uid=".$_SESSION['uid']." AND waehrung='".$_POST['waehrung']."' LIMIT 1");
$multi_kontoida=sql::$db->prepare("SELECT kontoid FROM "._VMS_."_multi_konten WHERE uid=:session_uid AND waehrung=:waehrung LIMIT 1");