function checkEmail() {
	var obj = document.getElementsByName('newsletter_mail');
	var email = obj[0].value;
	
	if(email.indexOf('@') == -1) {
		return false;
	}
	else
		return true;
}

function openApproval() {
	if(checkEmail()) {
		NewWindow('/approval.php?email=' + document.email.newsletter_mail.value + '', 'name', '400', '200', 'no');
		return false;
	}
	else {
		alert('Niepoprawny adres e-mail!');
		return false;
	}
}