You can configure your server to have them expire,
read here for info on apache .htaccess configs:
http://www.askapache.com/htaccess/speed-up-sites-with-htaccess-caching.html

(I have not tried this)
Make all files no cache, inside .htaccess file add:

<Files *>
Header set Cache-Control: "private, pre-check=0, post-check=0, max-
age=0"
Header set Expires: 0
Header set Pragma: no-cache
</Files>

or you can simply append a unique id to your image url
http://pastie.caboo.se/85642


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