Webhelp numbered toc tree

[Benjamin Taufer <benjamin@taufer.net>]

I'm playing around with the docbook webhelp output.
Customization works well, but I want to add the numbers of the chapters 
and sections to the navigation tree.
Related to this I've read the TOC Chapter 
(http://www.sagehill.net/docbookxsl/TOCcontrol.html). But as in 
webhelp.xsl has it's own toctree template (template "webhelptoc"). So 
the general customizion doesn't work.
So my questions: Is it possible to add the numbers to the toc tree? 
(Maybe with a parameter I haven't found?)
.. or is there another way to bring the numbers to the toc tree?

Thanks a lot.
Benjamin