Quick question - is it possible to re-write the URLs of externally hosted images so that an image residing at:

http://www.yourdomain.com/16151146112625252626.jpg

Will appear to reside at:

http://www.mydomain.com/images/nicely-named-image.jpg

I'm not worried about the system for actually coming up with a nice, clean name, just whether it's technically possible.

Rationale: it's a minor cosmetic thing; I'm pulling in third-party images legitimately and would prefer that users see them as hosted on my site should they look to save any down.

Any advice appreciated.

Thanks!