Move camera with left mouse button. Rotate object with arrows or AWSD + RF keys.
If your browser is not very smart (*cough* Firefox 4 *cough*) it will probably launch fast search on keypress. Sorry for that, no Z-axis rotation for you. Use arrows instead.
Main purpose of js3d was purely academic. Also, I wanted to prove that you can use 3d graphics although WebGL is still under development.
Currently it has a lot of hardcoded stuff (camera position, z-scanning constants, etc.), renders some artifacts and has performance issues.
If you want to carry on this project, feel free to contact me.