Getting flash to talk to each other on a webpage!

Guys and Gals,

I was wandering if someone could help. I am trying to make a flash leaderboard and skyscraper banner talk to each other on a webpage. The aim of what i am trying to do is make it so that each banner starts at exactly the same time once they have both loaded on the page, this will then make it appear that contents on one banner flow into the other.

I am stuck as to how I make the two talk. Maybe using PHP but that’s as far as I have got. I start hitting problems like what if two viewers from the same IP view the page, its gonna start messing with variables etc!

Does anyone have any ideas?

Any help or suggestions would be appreciated.

Thanks in advance,

Chewwie