La Bella Italia toggle broken

[WrothStudio]

The check boxes that toggle layer visibility on the La Bella Italia showcase page, http://kartograph.org/showcase/italia/ , do not hide the layers when clicked and seem to be broken.

Tested in Firefox [22.0] and Chrome [27].

It would be great to have this example actually work so it could be used as a helpful reference to people like myself who are very interested in using the toggle feature.