Changing a mouse cursor in flash

I have this code which makes a smooth rendering cursor in flash using updateAfterEvent();

how would I go about changing this code to work when you move your cursor over a particular movieclip e.g. mc_square.

Mouse.hide();
 
onMouseMove = function () {
feedback.text = "You are moving your mouse";
cursor._x = _xmouse;
cursor._y = _ymouse;
updateAfterEvent();
};
 
 
onMouseDown = function () {
feedback.text = "You pressed the left mouse button";
};
 
 
onMouseUp = function () {
feedback.text = "You released your left mouse button";
};
 
myListener = new Object();
myListener.onMouseWheel = function () {
feedback.text = "You are playing with your mouse wheel";
};
 
Mouse.addListener(myListener);

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