title: JQuery Find #ID, RemoveClass and AddClass
body: <p>I have the following HTML</p>
  
  <pre><code>&lt;div id="testID" class="test1"&gt;
          &lt;img id="testID2" class="test2" alt="" src="some-image.gif" /&gt;
      &lt;/div&gt;
  </code></pre>
  
  <p>I basically want to get to #testID2 and replace .test2 class with .test3 class ?</p>
  
  <p>I tried</p>
  
  <pre><code>jQuery('#testID2').find('.test2').replaceWith('.test3');
  </code></pre>
  
  <p>But this doesn't appear to work ?</p>
  
  <p>Any ideas ?</p>