http://jsfiddle.net/hqkm7/

http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.compilamasnaoroda.com.br%2F%3Fp%3D168

http://www.youtube.com/watch?feature=player_embedded&v=wEsIabmcs8I
http://www.rjmcnamara.com/2012/07/lego-mindstorms-nxt-x-y-plotter/
http://thenxtstep.blogspot.com/2011/11/queboid-shooter.html