This is the official Mathematica and Wolfram Language code highlighter for Mathematica.stackexchange.com and the Wolfram Community.
To use it with your installation of google-code-prettify, you have to
add the files (probably the minified versions) from the src folder into your code-pretty installation. The file lang-mma.min.js needs to go into
the google-code-prettify/src folder and the prettify-mma.min.css needs to go into the styles folder.
The difference between lang-mma.js and lang-mma.min.js is that the latter one is the minimized js-file.
All other information can be found in the google-code-prettify wiki.
Note that I also compiled a Joomla extension which lets you easily install the whole highlighting engine on your Joomla based website.
The resources folder contains another file: mathematica-source-highlighter.user.js which is a browser userscript that was used
to test the highlighter before it was officially installed at Stack Exchange.
The JavaScript can be opened with Google Chrome and is then installed as a local extension.
When you browse pages under http://stackoverflow.com/questions/ and have Mathematica code posted
on the page its style is replaced and you should see nice code highlighting.
This user-script was written by Tim Stone and I only added the rules for the lexical scanner and colors which go along with the page colors of StackOverflow.