i have written it and it uses the pear package Text_Highlighter. so it is no plugin that actually exists but is in developement.
the function i have written works in a plugin for a cms without any error, so i thought it must have something to do with wp
i used the plugin Syntax Highlighting plugin as collecting main and used its filter for my plugin
so the function highlite call must work, but the setrenderer() not
system: linux
server api: apache 2.0.52
php 4.3.9
wordpress 1.2.1