Rollover how 2

[Nionicle]

I want a ball to move to a certain y position on rollover.
Here is my code on the mc.

onClipEvent (enterFrame) {
this._y += (newy-lasty)/5;
}

and here is the code on my button

on (rollOver) {
lasty = _root.rollover._y;
newy = 225;
}

thanx in advanced people.

What seems to be the prob is that the mc wont recognize the variables declared in the button.

[senocular]

onClipEvent (enterFrame) {
this._y += (newy-this._y)/5;
}

on (rollOver) {
_root.rollover.newy = 225;
}