function validate() {
	var x = document.contactsender.CommentFrom.value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	if (filter.test(x)) {
		document.contactsender.submit.disabled = false;
			} else {
				document.getElementById("emailtext").innerHTML="Please enter a valid address.";
				document.contactsender.submit.disabled= true;
	}
}