[Prototypish Style Sheet Switcher](HREF): Harald Ström has created a small javascript style sheet switcher that leverages Prototype.js in a nice way.
> This is a Prototypish rewrite of Paul Sowdens Style Sheet Switcher. The original version has a lot of global functions so I put everything into a class instead and made the code a bit more elegant. It should work as the normal one except for some methods have been renamed.

Includes cookie support and seems to work both cleanly and reliably