> In this case, the image is part of the page content rather than just
> decoration so it needs to be an img element.  Given that constraint,
> I think the javascript rollover (choice 3) is the best bet.  This
> still doesn't do anything for people with images turned off, or text
> based browsers.  You might want to consider adding some appropriate
> text to the link and hiding it via css.

Isn't that what alternative text provided in the alt attribute is for?
No need for image replacement.

-- 
Chris Heilmann 
Blog: http://www.wait-till-i.com
Writing: http://icant.co.uk/  
Binaries: http://www.onlinetools.org/
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