title: Twitter 2.2 carousel example: how to maintain image ratio?
body: <p>If you reduce your window browser width while you're on <a href="http://twitter.github.com/bootstrap/examples/carousel.html">http://twitter.github.com/bootstrap/examples/carousel.html</a> you can see that the background image aspect ratio changes.
  I would like to maintain it (1:1), cropping my image on the left, or on the right, or aligning it horizontally.</p>
  
  <p>What do you suggest?</p>