Slide playes from the start when changing browser window

I have this really anoying problem.

The course is packed with advanced actionscript. But this (I think ) should not have anything to do with that.

The course works just fine the first time the user takes it. At the end its a button that show up if the user have not answer all questions in the course. The user can then click the button and the scoeboard gets reset and all questions are reset. The user gets send to the first slide of the course. That all good.

But the at the end I have a slide with a slide video. At the end of that slide is two buttons with a pause on them. Now to the problem.

As soon as I click on another browser window in the same browser. The project starts to play from the beginning of that slide. When I go back to the window with the course. It pause.

How can it be that clicking on another browser window gets the project to start playing. And then pausing when I return to that window?