"Smart" quotes and dashes in PSGML

I write (X)HTML documents in Emacs using PSGML mode. At the moment,
whenever I've finished a document I do various search-and-replaces to
get proper punctuation marks, such as replacing ' with ’, -- with
–, --- with —, and " with either “ or ”. I was
wondering whether anyone had written a function which would do that
automatically as I type, rather like lots of word processors do, but
which would not touch anything within a tag (such as the quote marks
around attribute values, or the comment markers)?

TIA, Darren

-- 
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D. D. Brierton            [email protected]          www.dzr-web.com
       Trying is the first step towards failure (Homer Simpson)
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