Code examples on website are not visible

The code snippets in the user guide, cookbook, and elsewhere on groovy.codehaus.org are not visible. Instead of a box containing something like:
println 'Hello World'
A small empty rectangle is displayed instead.
It looks like this syntax highlighter library is being used: http://alexgorbatchev.com/SyntaxHighlighter/manual/installation.html. However, looking at the source of the page it appears that the javascript and css libraries that it uses aren't actually loaded, nor is the SyntaxHighlighter.all() JavaScript method invoked.