I am using the validate plugin
http://bassistance.de/jquery-plugins/jquery-plugin-validation/ and would like to use some conditional validation, if a user does not select an option from the contact_person_id select field then they must enter something in both the input fields below it, what is the best way to achieve this, preferably with a warning message generated if the user tries to submit without either selecting an option or entering content in the two input fields.