Dragging a MC with limitations?

[Danger Madcow]

I know this is a painfully simple question, but I have something like this:

on (press) {
	startDrag(this);
}
on (release) {
	stopDrag();
}

And what I'd like to do is set limitations so as the image is being dragged, it can't go past certain X/Y limits that I specify. How should I set this up?