title: phonegap : Detect volume change
body: <p>I have an phonegap application, and I need to trigger an event when a button is pressed on the device (not a button on the screen).</p>
  
  <p>Is there a way to detect, say, volume change (in iPhone and maybe other devices too) ?</p>
  
  <p>I use <a href="http://phonegap.com/" rel="nofollow">Phonegap</a>, <a href="http://code.google.com/p/mgwt/" rel="nofollow">mgwt</a> and <a href="http://code.google.com/p/gwt-phonegap/" rel="nofollow">gwt-phonegap</a>.</p>