Auto refresh page

Hi guys
Somebody tell me how do I achieve this:-
I have made a web site in flash. Its fine and working ok.

But the problem is, When the user will minimize the browser and user restores the browser, at that time page should do auto refresh.

Lets say user is visiting my site in FF or opera or some other tab browser. And the user has opened so many sites. For a moment, he left my site and went to another site, which he had opened in his browser. And again he came back to my site, At this moment my page should get refreshed automatically.

Or else similar to this one site.
until and unless user set focus on this site. The flash object won’t load to the site.

Any one know how do achieve this.
Thanks for your time