macintosh IE 5.0 and 5.1 image caching

Anon

I am having troube forcing IE on the macintosh to "not cache" a dynamically generated image. If the user right clicks on the image and "refreshes" it, then it shows up correctly. This is basically how my files are ( shortened for brevity sake ). This works on all windows machines, and on netscape on macintosh. I have tried many differnt headers, and have had no luck. Any suggestions?

index.php
<?php
header('Expires: -1');
header('Pragma: no-cache');
header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
?>

makeimage.php
<?php
header("Content-type: image/jpeg");
header('Expires: -1');
header('Pragma: no-cache');
header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
?>

/ I do my image stuff here based upon user(snipped) /

ImageJPEG($image);

Anon

Here's a trick I use:

If the browser caches the images, but not the pages, you could add a random query string to the image path.

e.g. <img src="makeimage.php?user=<?php echo $g_user; echo "&rand="; echo rand(1,10000);?>">

This should force the browser to request a different image from the server.

If the browser is cacheing the pages, that's another problem because the rand value would be the same every time.