This is the Box2DFlash demo, using Jangaroo to run without Flash. If you have turned off Flash or no Flash available (e.g. on iPhone), the original Web-site says: You need Flash to view this content. Box2DFlash is an actionscript library, do you really think you could avoid Flash on the website? Actually, yes. It is possible! Above, you see the original Box2DFlash framework and example code recomp