I think you need to "fool" IE. When you call the script, add an image file extension to the end:

http://www.site.com/cgi-bin/script.cgi?other=parameters&etc=etc&dummy=
+image.jpg

or add path info to the end

http://www.site.com/cgi-bin/script.cgi/image.jpg
[download]

At least, I *think* that was how I solved it...

.02

cLive ;-)