krik,
thank you for your reply.
There is no output before setcookie(). If I access login.php file directly, it can set cookie but if I include this file in in another file (registracion.php) it can't set cookie in all browsers except Firefox.
There is no output in registracion.php file - it contains only 2 lines:
define("ILANGUAGE", "es");
include_once '../../login.php';