[F8] Old file script problem

programming flash
1

I’m trying to get a compass effect and with these script I can, but how can I get some easing effect?

onClipEvent (enterFrame) {
myRadians = Math.atan2(_root._ymouse-this._y, _root._xmouse-this._x);
myDegrees = Math.round((myRadians*180/Math.PI));
this._rotation = myDegrees+90;
}

Thanks in advanced!