title: How to navigate back one page using $.mobile.changePage
body: <p>All of the JQuery Mobile documentation I can find about navigating backwards assumes I am going to do this using an anchor tag and suggest I add <code>data-rel="back"</code> to the tag.</p>
  
  <p>I'm not navigating from a tag, I'm mixing with PhoneGap which means I'm calling javascript functions like <code>PhoneGap.something(goForwardOnSuccess,goBackwardsOnFailure);</code></p>
  
  <p>where </p>
  
  <pre><code>function goFowardOnSuccess()
  {
      $.mobile.changePage('#next', { transition: 'pop' });
  }
  function goBackwardOnFailure()
  {
      $.mobile.changePage(/* I HAVE NO IDEA WHAT GOES HERE */);
  }
  </code></pre>
  
  <p>One of the main things I'm using this sort of thing for is putting up a "Busy Doing Something In Native Code Don't Touch Me..." click shield screen with the "loading" stuff and then closing it in the completion functions.</p>
  
  <p>However, I find when I try that from a button on a screen I "popped" into place, I find myself back at the home page (goes back two levels).  </p>
  
  <p>The documentation is maddeningly vague about how to navigate backwards from pure javascript.  Any clues would be very nice.  </p>
  
  <p>Notice also that I tend to pop these busy screens from everywhere so explicitly coding a transition back to the screen I want isn't really an option.</p>