Loading several external SWF's

I have a design where I am loading 2 SWF’s in one paren’t SWF. the main SWF would just include the background and buttons. I am loading a banner and content box as external SWF’s. How can I make the buttons interact with both SWF’s. I want it to be so when I roll over the buttons, both external SWF’s change frames. Thanks.

Mike