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[Karl Berry]

It shouldn't be necessary to postprocess the html. If [About] fails,
PRE_BODY_CLOSE does work, as far as I can tell. I think you failed to
see the footer in some nodes because your css made the new footer text
overlap with the last line of node text.

In general I don't think it's possible or desirable for PRE_BODY_CLOSE
text to end up on the navigation line at the bottom. That line might be
quite long, depending on the node names, see, e.g.,
  _005cbigskip-_0026-_005cmedskip-_0026-_005csmallskip.html
and with short nodes there is no navigation line at the bottom at all,
unless we change that. (Just depends on the WORDS_IN_PAGE variable.)

So, all in all, I think the PRE_BODY_CLOSE text has to follow the
navigation line. Which is why I started looking into the "About" button.
(One might wish there was a way to define new navigation buttons, but I
don't think there is. Been too long since I was working on all this ...)

Later ... -k