Source code syntaxhighlighter installation
From Klaus' wiki
Download the latest version to a workstation:
svn co http://svn.wikimedia.org/svnroot/mediawiki/trunk/extensions/SyntaxHighlight_GeSHi
Send the downloaded to the remote wiki-server
scp -r SyntaxHighlight_GeSHi root@kalashnikova.hih.au.dk:/var/www/html/klaus.ede.hih.au.dk/extensions/
Add this line to your LocalSettings.php
require_once("$IP/extensions/SyntaxHighlight_GeSHi/SyntaxHighlight_GeSHi.php");
Look on this [1] page for the supported languages.