Opening a new window

Hi i am making a game and i would like to open a new windows when i click play Example:
i test my movie, there is a screen that has a button that says play (would be better if borders are taken off so people wouldn’t be able to expand the screen) So i click on play and a new window appears and starts the game.

It would also be great if you tell me how to close the screen with my own button.

And please notice i am using an iMac (mac computer just incase) i have mozilla, IE 5, opera and netscape just in case it doesn’t works with safari. Thanx alot