converting jpg to jp2

[JJoe]

Assuming that you have the plugin installed.

http://www.morgan-multimedia.com/JPEG200...how-to.htm
Does the page work without the "jpg to jp2" proxy?
If so, I'd think the "HTML" problem isn't the problem.

If the proxy converts the jpg to jp2 but the filename remains "example.jpg", you may need to alter the content-type header. Otherwise, I'd guess: Opera may ask to download a file; IE may show the picture. The proxy's instructions should cover this problem.

HTH