title: jQuery Validation - Two fields, only required to fill in one
body: <p>I'm using the <a href="http://bassistance.de/jquery-plugins/jquery-plugin-validation/">jQuery Validation Plugin</a> on my form. On my form I have a 'Telephone' field and a 'Mobile No.' field.</p>
  
  <p>How would I go about making it so the user has to fill in one of them, but it can be either field?</p>