Background movement

1

Hi!

I’m trying to make my background move. But some problems appears:

Example:

www.tomaraquecaia.com.br/v01/

. my background graphic has 8000px width;
. the background moves as the user moves the mouse.

Here’s what I want to do:

  1. when the background comes to it’s end, the movement stops.
  2. if the user click outside the browser, or change to another software, the movement stops. With my code the movement stills scrolling.

Any clues?

Thanks!