OK, thanks to Marco Schoemaker's hint on how to do this in HTML,
I've cooked up a patch that should do this.
Unlike Marco, I don't want to introduce yet another special tag for
the tooltip. It will display the COMMENT text, or the DESCR text
if there's no COMMENT defined. If neither exists, it will just
display the hostname.
The attached patch is based on the current snapshot, but modified so
it should work with Hobbit 4.2.0. Those on the bleeding edge version
will have to wait for tonights snapshot.
Regards,
Henrik