function validate()
{
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	var elem = document.forms[0]["email"];
	if(elem.value.match(emailExp)) {
		return true;
	} else {
		alert("Please enter a valid email address.");
		elem.focus();
		return false;
	}
}