DOCBOOK: clunk.pl

Hello,
I am learning XSL and find Norm Walsh's
docbook.xsl works well for Docbook instances.
However, not being a programmer, I find chunk.pl
difficult to read. Can anyone tell me which
bits to adapt/change to make it work?

Thanks and regards
Dr. Marc Beckers
Documentation Consultant
Software AG
Uhlandstra絽 12
D-64297 Darmstadt
Phone +49-6151-92-1322
Fax              -1612
E-Mail 
Internet www.softwareag.comds,