function isValidEmail(email) {
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	return !isEmpty(email) && filter.test(email);
}
function isEmpty(str) {
	return (str==null || str=="");
}