how to detact the browser maximized from flash

In my game i have added a timer, which will clear the game at every 20 min. now my problem is i have minimized my game for 10 min then ill open, now my game is not clearing in 20 min duration. i came to know that from flash palyer 10 when the browser gets minimized, to save the cpu usage whole flash events will be stopped and starts again when it is maximized.

if i am correct, i like to know how do we detact the browser maximized from flash

thanks in advance