function validEmail(email) {
	if (email=="" || email==null)
		return false;
	else {
		var emailReg1 = /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/; // not valid
		var emailReg2 = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,6}|[0-9]{1,3})(\]?)$/; // valid
		if (!(!emailReg1.test(email) && emailReg2.test(email)))
			return false;
	}
	return true;
}