rotation - Javascript rotate image with mouse coordinates -

I am using a vertical effect which is the mouse position of users (http://webdev.stephband.info/ jparallax / Index.html). I am trying to find out in a way that the ball will rotate too. So it will appear as if the user transfers his area on the mouse, runs on the ball screen.

I have found some JavaScript examples that show how to rotate an item on a mouse click, I do not just put all this together in JS to make enough lid.

P> This is more tactical advice than a reply, but the rolling ball To look realistic, make sure that it rotates at the rate that corresponds to the circumference of the ball otherwise it will look fake.