If you want to defeat the cache you could try appending the current time
as a query string:
img.src = "" + "?" + (new Date()).getTime();
-blair
Another solution would be to, in your image generating script, send HTTP headers that tell the browser not to cache the file.
Here's the PHP code that would it:
header('Pragma: public');
header('Expires: Thu, 19 Nov 1981 08:52:00 GMT');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Cache-Control: no-store, no-cache, must-revalidate');
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