Thanks a lot to everyone's replies. At least, there is a discussion on that matter.
But my goal was specifically to point out that, and without your contributions, someone in the process of learning Mootools just from the Docs would have had a hard time solving this issue. I really think that Docs should be a little bit more self-explanatory sometimes. Or less confusing, like the keyboard method constructor example : http://mootools.net/docs/more/Interface/Keyboard#Keyboard My guess : http://jsfiddle.net/ghazal/svtF6/
