IIS7 Output Caching and Firefox

Hi All,

I currently have an ASP.Net application that displays pictures that are composited with different borders that can be selected by user on a page they look at before the final image page. i.e.

thumbnail gallery -> border selection page -> final image

Currently if I select the border and go to the final image all is fine. Then if I browse back to the borders page and select a new border and go to the final image page the image with the previously composited border is still there (the final image file name is the same regardless of border selection).

I've gone into IIS7 and tried setting the Output Caching for ".jpg" and ".aspx" to prevent all caching but that doesn't seem to work with Firefox. IE7 does refresh the image when I change border.

Any ideas?

Thanks for the help in advance

Cheers,

Mike