title: BlockUI spinner not loading
body: <p>I have a page, that when the user clicks a button, I use 'blockUI' (<a href="http://malsup.com/jquery/block/" rel="nofollow">http://malsup.com/jquery/block/</a>)  to show a modal message saying, 'Sending' with a spinner.</p>
  
  <pre><code>$('#btnSend').click(function () {
      $.blockUI({ message: '&lt;h4&gt;&lt;img src="http://www.example.com/images/busy.gif" /&gt; Sending email...&lt;/h4&gt;' });
  });
  </code></pre>
  
  <p>When I copy that URL into a browser, I see the spinning image. However, on the site, it shows an invalid image placeholder, as if the image file isn't there, or it's an invalid URL.</p>
  
  <p>When I 'view source' and copy the URL on the page into a new browser, it works fine. Do I somehow have to pre-load the image? </p>