title: Display alternate image
body: <p>Is it possible to show an alternate image if the original source file is not found?
  I would like to achieve this only with css and html, no javascript (or jQuery and alike).
  The idea is to still show an image instead of the "alt" test or default (ugly) cross of IE.
  If not possible without javascript I will then rather check the img src with php with a basic if-then-else.</p>