function verifyNewsletterForm(form) {
	if(!isEmailAddress(form.newsletter_email)) {
		alert('Please enter a valid email address.');
		return false;
	}
	return true;
}

function isEmailAddress(element) {
	var str = element.value;
	var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
	if(!str.match(re)) {
		return false;
	} else {
		return true;
	}
}

function clearDefault(element,defaultValue) {
	if(element.value == defaultValue) {
		element.value = '';
	}
}