HTTP header problem causeing "Downloading picture..." bug in IE6

I have a page designed to move a JPG image around inside a smaller window.  This page works fine in FireFox and IE6 when accessed via local hard disk or via IIS.

I have a small webserver (coded in C) built to host files out.  When I use this webserver to host the files, FireFox works perfectly.  IE6 displays "Downloading picture..." every time I move the JPG image around.

I have verified with a packet analyzer that IE6 is not communicating with the server when it displays this, but it prevents the JPG image from moving for 2 seconds.

I believe that the only difference between IIS and my webserver is the HTTP headers that are sent.  Do you know what HTTP headers could cause this to occur?
Tim TitusCTOAsked:
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mrcoffee365Connect With a Mentor Commented:
You might try giving the Content-Length header parameter -- that could be why there's a delay from IE6 in download.
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