title: jQuery: How to make a field required if two specific options are selected
body: <p>Validating a form w/ jQuery.  For simplicity, user selects from three options: "A_or_B", "C", or "D" from a drop down list.  If A_or_B is chosen then the "Name" field is required.  If C or D, then it isn't.  This was done like so:</p>
  
  <pre><code>$("#form").validate({
  rules: {
      Name: {required: "#Letter[value=A_or_B]"}
  }
  });
  </code></pre>
  
  <p>Now I am required to make "A_or_B" into two seperate entries, where either choice still makes the "Name" field required.  How would I change the validation line for the <strong>Name</strong> field now that A and B are seperate entries on the drop down list?</p>