function checkNEmail(frm) {
    re = new RegExp("^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.(([0-9]{1,3})|([a-zA-Z]{2,3})|(aero|coop|info|museum|name))$");
    if (!re.test(frm.Email.value)) {
        window.alert('Tento email není platnou adresou elektronické pošty!');
        frm.Email.focus();
        return false;
    }
    return true;
}