title: Jquery set radio button checked, using id and class selectors
body: <p>Is it possible to set a radio button to checked using jquery - by a class and an id?</p>
  
  <p>For example:</p>
  
  <pre><code>$('input:radio[class=test1 id=test2]).attr('checked', true);
  </code></pre>
  
  <p>I only seem to be able to set it by id OR class but not by both.</p>