title: change background image for the main window in Titanium-iphone
body: <p>I have the following in Titanium:</p>
  
  <pre><code>var imageArray = [];
      imageArray[0] = 'photo0.png';
      imageArray[1] = 'photo1.png';
      ....
      imageArray[N] = 'photoN.png';
  
  
  var win1 = Titanium.UI.createWindow({  
      title:'Tab 1',
      backgroundImage:imageArray[0],
      backgroundColor:'#fff'
  });
  </code></pre>
  
  <p><code>win1</code> is my main window and when I click a button I want to change it's <code>backgroundImage</code> without need for recreating the window. Anyone any idea of how could I do that?</p>
  
  <p>Thanks</p>