title: preload css-background-images for jquery transition in sencha-touch
body: <p>in my sencha-touch appp I have a jquery animation of the backbround-images via CSS-transition. the problem is that the fades to the next images doesn't work unit every image has been fully loaded once. so the first round of the slideshow isn't smootly changig.</p>
  
  <p>is there any way to preload the images used as css-background-images?
  thnx!</p>