[O] Displaying Pretty fontification of source code blocks

[Rodolfo Aramayo]

Hi,
I have downloaded the org-source file corresponding to:
http://orgmode.org/worg/org-contrib/babel/examples/fontify-src-code-blocks.html

Installed color-theme-leuven.el
Opened the file in emacs and exported as html
Despite my best efforts I cannot make the file display the pretty color I see in the web site for the emacs-lisp code block

The emacs-lisp code blocks seems to be properly displayed in emacs (I can see blus and green fonts) but never in the html file

Ideas?

Thanks