function checkform() {

	var email;
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i

	if (filter.test(document.getElementById('xdtg-xdtg').value)) {
		email = document.getElementById('xdtg-xdtg').value;
		var a = true;
	} else {
		alert("Please enter a valid email address.");
		var a = true; return false;
	}	
	return true;
}