Cacheing cgi

I have a cgi script which creates a HTML page with graphics. Everytime the script loads, the graphics would load again.
How do I cache the graphics in a CGI generated html page?
AphroditusAsked:
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makerpCommented:
in the header you need set the expiry of the page.

in perl using the cgi.pm module the following will make a page expire in 3 days

use CGI;

$query = new CGI;

print $query->header(-expires=>'+3d');

+30s                              30 seconds from now
        +10m                              ten minutes from now
        +1h                               one hour from now
        -1d                               yesterday (i.e. "ASAP!")
        now                               immediately
        +3M                               in three months
        +10y                              

if your using C/C++ etc then you will need to send this header out in the response to the client before your body of the doc goes out. w3.org will give you the correct header format for the date of expiry etc.
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makerpCommented:
you can use -expires=>now as the parameter for expriry if you want it not to be cashed. also i think that browser settings override this cash.

i.e if your browsers set to always get a new page then cashed items are ignored.
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