Is there a way to cache ONLY the images?

[Anon]

I'm working on a site which store images and data about the images. The data changes fairly often, but the images don't.

I want to save bandwidth, so I'd like to cache the image on each detail page.

On the other hand, I want updated descriptions etc. to show up when they change.

Is there a way, in HTML, PHP or otherwise, to cache specific parts of a page?

Thanks in advance for your help,
Chris