Davide
I was wondering whether this would be possible once Google made
scripts available, but I don't have ready access to a google apps
domain with scripting. There is a greasemonkey solution for gmail,
but that won't work with google docs.
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I'm afraid that makes using MathJax in a Google Site pretty much
impossible. I would be happy if someone would correct me on this, but
that is my reading of the documentation, and the conclusion I reached
by experiments with Google Apps Scripts.
Davide
I also tried my insertion-via-javascript method which works on other
sites (see http://checkmyworking.com/2012/01/how-to-get-beautifully-typeset-maths-on-your-blog/)
and that fails with a lot of mysterious errors.
I think google's Caja security thing
(http://code.google.com/p/google-caja/) is preventing MathJax from
doing the clever things it does.
cp
Davide