I have a movie clip Screen which contains another movie clip dragger. (a drag bar)

I will be attaching instances of this clip as needed.

What I want to do is write a function so that when the dragger bar is pressed in any of the instances of the Screen clip, that instance of Screen can then be dragged.

This function resides in a class Screen which is linked to the movie clip and I am using AS 2.0

This is more or less what I have come up with

Code:
function drag() {
	dragger.onPress = startDrag(true);
	}
What's throwing me is the paths and use of this in AS 2.0 I know it's simple, sorry this is my first class.

Thanks for your help