His technique requires a hit back to your own server using an AJAX call. This was necessary before gravatar implemented the 404 code. The problem with this sort of thing is that it's more prone to breaking, since the php on your server has to be able to make hits out to gravatar.com to get the gravatar, which won't work in some setups. It's also slower.
The technique I used is pure javascript, talking directly from the browser to gravatar.com. No need for any hits back to your own server at all.
The plugin I wrote is running on my own site: http://ottodestruct.com/blog/wordpre.../gravatar-box/
Put your email address in the proper comment box. Put in a bad email as well. Just click outside the email box (or tab to the next field) to see it activate.


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