Romain,
Try setting the HTTP Header field Cache-Control to
no-cache.
I found the code below at

http://www.zope.org/Members/rbeer/caching:



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN">
<dtml-call "RESPONSE.setHeader('Expires', '-1')">
<dtml-call "RESPONSE.setHeader('Cache-Control',
'no-cache')">
<dtml-call "RESPONSE.setHeader('Pragma', 'no-cache')">
<HTML>
<HEAD><TITLE><!--#var title_or_id--></TITLE></HEAD>
<BODY>


--- Romain Slootmaekers <[EMAIL PROTECTED]> wrote:
> Yo,
> We have problems with some browsers being to eager
> to cache images, and
> therefore not displaying the right image when the
> image has changed at
> server side. 
> 
> This is especially so with Netscape 4.7X. Setting
> the browser's cache
> preferences to 'compare every time' doesn't help
> much.
> 
> This problem is especially annoying after an image
> upload: the user
> changes the file with an upload but the image
> displayed by the browser
> remains the same.... and thus the user gets
> confused.
> 
> Anyone any ideas ?
> 
> TIA,
> 
> Sloot. 
> 
> 
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