Box2D Physics Engine
Box 2D physics engine is a great tool for making physics effect like gravity,inertia using javascript. This is a great javascript Physics engine to provide real world javascript. You can see the demo at http://box2d-js.sourceforge.net/. There is another amazing demo builded in http://mrdoob.com. You can see the demo here. Dont forget to shake your browser. And click to make new balls. Double click to startover. You can download the Script from Box2D Website. This library will help you to build flash like animations using javascript.
that’s all cool js lib, thank you very much for sharing.
Du gros lourd en javascript !! C’est enorme ça !