var Newsletter = new Object;

Newsletter.add = function() {
	var email = document.getElementById('newsletter_email').value;
	var url = '/newsletter';
	var params = 'email='+email;
	
	if (email) {
		ajax(url, params);
		document.getElementById('newsletter_email').value = '';
	} else {
		alert('Proszę wpisać adres email.');
	}
}