(flash mx)draggable mc with boundry?

Hello everyone, I’d just like to say thank you for every person that has helped me in the past; i hope that you all can help me out once more. I have a menu that i need to be able to drag, but the menu is only allowed to be dragged to a certain constraint. (i.e. before the menu can no longer be visible within the .swf) I have the basic drag ac:

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

How would i go about adding constraints to this mc? Thanks in way advance everyone. Take care

Victor.