Hello, this probably no related to PHP, but I don't know where to ask.

When retrieving and updating images from MySql record, I noticed Netscape sometimes 
fooled by cache values, then it won't show correct image but previous image instead.

How can say to browsers 'hey, please don't cache this <img src....>  statement"?
Note inside src there is PHP program <img src="show.php?image=....>

I read entire chapter 14.9 "cache control" from http doc but didn't understand .

Thanks

Mig





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