function validateEmail(emailField) {
	var str = emailField.value;
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
	if (!filter.test(str)) {
		alert("Please input a valid email address!");
		emailField.select();
		emailField.focus();
		return false;
	}
	return true;
}