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Dynamic <IMG>

I'm trying to generate some PNG's on the fly, and include them in some
web pages.  The C program I wrote to create them dumps the PNG data
stream to stdout.  I can dump the output to a file and it looks perfect.

I don't want to include a PNG _file_ in an <img> tag, though, because
some stupid browsers cache it, no matter how they're configured.

So, no problem, I think.  Rather than point to a file w/ my <img> tag,
I'll point to the program.  Like <img src="/cgi-bin/tile" alt="blah
blah" width="512" height="512" border=0>.  Doesn't work.  I've checked
that ownership and permissions of program are o.k. to be run by Apache.

Does /cgi-bin/tile need to output something differently than if it were
simply dumping a PNG to a file? 

I'm confused.  I thought this kind of thing was supposed to work.  No? 
If this is possible, let me know, and I'll keep hacking.  As long as I
know I'm not wasting my time...


Ron Peterson
Systems Manager
Wallace Floyd Design Group
273 Summer Street
Boston, MA  02210
617.350.7400 tel
617.350.0051 fax
rpeterson at
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