title: get iframe from backround page chrome extension popup
body: <p>I am making an extension that when you click on the icon, a popup comes up that displays <a href="http://html5.grooveshark.com/" rel="nofollow">http://html5.grooveshark.com/</a> and plays music. I want to be able to have it run in the background so the music will play, even after the person clicks away from the popup. If I set my "default_popup" to an HTML file with the code below, it shows Grooveshark, and plays music, but stops playing music after the popup is closed. How do I get it to keep playing music in the background? </p>
  
  <p>Code (Displays Grooveshark.com)</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  
  &lt;style type="text/css"&gt;
          body {
               width: 500px;
               height: 300px;
               }
  &lt;/style&gt;
  
  &lt;body&gt;
  
  
  &lt;iframe src="http://html5.grooveshark.com/" width="100%" height="500" frameborder="0"     scrolling="yes"&gt;&lt;/iframe&gt;
  
  &lt;/body&gt;
  
  &lt;/html&gt;
  </code></pre>