forcing a browser to re-cache images

[dmmh]

can it be done at all?

I dont want to add some generated time string to the image or something, I just want the browser to do a hard refresh so to speak if an image has changed. Now I know where Ill use this, so calling it isnt an issue, but I just dont know if it can be done :)

[dreamcatcher]

If its possible I`m guessing it will be a javscript issue as PHP cannot control the behaviour of the browser. You need to look at client side stuff, so maybe try in the javascript section?

[ergophobe]

Considering that with IE, I often have to clear the cache and then close the browserand restart to get images to refresh, I think this will be an uphill battle no matter which method you use. You can try some of the header and meta tags that control caching, but i don't think they'll help much for IE and images.

[dmmh]

ctrl-f5 always does the tick for me ;)
just wondered if I could force it somehow, without javascript if possible :)