Facebook FBML and frame redirect

Question

I have, what is probably a simple flash question.

I have a flash countdown clock I am using in an Iframe of a facebook app. At the end of the countdown it fires this off

myFlipCountDownClock.onFinish = function() {

};

And I can add getURL or whatever.

My problem is I need to fire off some facebook specific code. This being

This does not work via getURL.

My question is how could I pass this line of code? I am not sure what to do here. Any help would be greatly appreciated.