To use the GeSHi filter, you need to have the GeSHi highlighting engine. You can get it from 
http://qbnz.com/highlighter/
The sourceforge download page is: http://sourceforge.net/project/showfiles.php?group_id=114997

Although the filter works with the version 1.0.x and the developement version 1.1.x of GeSHi,
it is recommended to use the version 1.0.x at the moment.

The easiest way to install GeSHi is to just put the 'geshi' folder inside the geshifilter module
folder. If you want to put it somewhere else you have to set the path in the settings first.

After enabling the module, go to 'Administer > GeSHi Filter' (admin/settings/geshifilter) and
configure the global settings. Then enable the filter in an input format to use it.
