It can be done using JavaScript in IE only, AFAIK (the code has been posted several times in the last month if you use the search facility).
However, I'd say that for a more cross-browser approach, a server-side tweak to the MIME type would be required - which would mean you would have to give the images a unique extension (otherwise regular images may fail to load, unless your web server can do this on a directory-by-directory basis).
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