DOCBOOK-APPS: website.dtd: relative filenames

I want to separate parts of my HTML files in different subdirs and
cannot find a way how to set the relative paths in the XML file :-(

If I try e.g.:
<config param="filename" value="dirA/index.html">
I get the HTML-file in the correct subdir, but the links back
to the other parts are wrong (because of the relative "dirA" which
results e.g. to "dirA/dirB/index.html").

So:
- how do I have to set this config value?
- do I have to put the XML-files in the subdirs?

Thanks
Michael
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