Rotating Thumb Pic of the Day script

[Ms Naughty]

Does anyone have any suggestions for a script that creates a pic of the day in thumbnail form? The sort where the user can whack it in a sidebar and it links to your larger pic of the day?

There are sponsors who offer this. I only need to add this code to my page:

<a href="http://www.sponsor.com/potd?refcode"><img src="http://www.sponsor.com/thumb.jpg"></a>

and their script does the rest.

So I'd essentially need a script that automatically rotated the hotlinked thumbnail on a daily basis.

Or any kind of thumb POTD script would be good.