Or you might be able to use the relpath filter:
http://groups.google.com/group/webby-forum/browse_thread/thread/5fb997970446d137
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vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407
The solution I've used is to have a deploy task that configures the
BASE_PATH on the command line. When the deploy takes place, the output
is regenerated with the correct basepath.
I've not looked at Joel's relpath filter, but he does good work, and
it is to be trusted!
Blessings,
TwP