title: How to check that a form has AT LEAST one field filled in
body: <p>I'm in the final stages of building a site and have one key task left: To setup some form validation that stops users being able to submit a blank search.</p>
  
  <p>I'm aware of the following post, but have found this unclear on how to get it to work, and how to use this for dropdown's (<a href="https://stackoverflow.com/questions/1300994/jquery-validate-require-at-least-one-field-in-a-group-to-be-filled">jQuery Validate - require at least one field in a group to be filled</a>)</p>
  
  <p>Any ideas on how I can do this, or any pointers to a guide that may help, will be massively appreciated?</p>