What is the AS to determine size of new windows?

Does anyone know how to change the size of a window when using a link to an external file in flash mx?

And another problem in my new flash site (not up yet) I’m using nav buttons to load external swf’s into containers. In that external swf is also anothe set of buttons which also load external swf’s into it. When I just preview the portfolio file I can click on the button and the other external file will load however when I preview my whole site that link does nothing. Anyone?

Thanks for your time.