Perfect. Does what it says on the tin.
This is a very elegant script. As the author says in his description, it leaves the controls visible as semi-transparencies over the map. Easy to toggle. When combined with the fullscreen mode of my browser (Firefox), it makes maps very usable on my 1280 x 800 laptop display.
I haven't tested this for long enough to be sure there are no bugs, but I am not expecting to find any.