http://developer.apple.com/safari/library/codinghowtos/Mobile/GraphicsMediaAndVisualEffects/index.html
http://box2d-js.sourceforge.net/index2.html
http://www.walterzorn.com/jsgraphics/jsgraphics_e.htm
http://www.walterzorn.com/jsgraphics/jsgraphics_e.htm