conditional form validation using jquery.validate.js plugin

Question

Can anyone tell me how to write a rule that validates if neither one radio button option nor the (optinal) textfield is chosen/filled by a user? The rule should only give a

Answer 1

maybe can this:

$('#myForm').submit(function() {
    if($('input:radio').val() == '' || $('#email2').val() == '') {
        preventDefault();
        // show error
    }
}