title: Changing button data-theme dynamically in JQueryMobile
body: <p>I'm having a little trouble dynamically changing a button's theme dynamically.  From a different post I learned to use:</p>
  
  <pre><code>&lt;input type="button" data-inline="true" data-mini="true" data-theme="c" id="my-button" value="Save"&gt;
  &lt;script&gt;
  $("#my-button").buttonMarkup({ theme: 'a' }).button('refresh');
  &lt;/script&gt;
  </code></pre>
  
  <p>Technically this works, until I mouse over - then the button falls back to data-theme "c".  Is there a better way to dynamically change theme?</p>