Auto-embed watermark script ??

Is there such a thing as a script that sits on the web server and can add a watermark to an image everytime one is uploaded?

Thanks in advance.

http://www.hotscripts.com/cgi-bin/search.cgi?bool=AND&query=watermark&catid=2

Spookster, firepages: Can we have a sticky on top with a link to hotscripts.com, phpclasses etc.? Please.