registerNewsletter = function() {
	var emailMask = /^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i;
	var email = document.forms['newsletter_form'].elements['newsletterEmail'].value;
	if (email == "") {
		alert(newsLetterMessages.emptyField);
	} else if (!emailMask.test(email)) {
		alert(new Template(newsLetterMessages.invalidField).evaluate({value: email}));
	} else {
		$('newsletter_form').request({
  			onComplete: function() { 
  				document.forms['newsletter_form'].elements['newsletterEmail'].value = '';
  				alert(newsLetterMessages.response);
  			}
		});
	}
}