function validate() {
	var frm = document.getElementById('newsletterForm');
	var isValid = true;
	var el;
	var r;
	
	var errorColor = "#f0d0e0";
	var validColor = "#ffffff";

	// email
	el = document.getElementById('email');
	r = /^[a-zA-Z0-9\._\-]+@[a-zA-Z0-9\._\-]+?\.[a-zA-Z0-9\._\-]+$/;
	if (!r.test(el.value)) {
		isValid = false;
		el.style.backgroundColor = errorColor;
	}
	else
		el.style.backgroundColor = validColor;

	if (isValid)
		frm.submit();
	else
		alert("Please provide a valid email address");
}