Movie clip visibility triggered by Mouse position

[AS3.0]

wait use this:

stop();
var LDSroot = MovieClip(root).LDS;
stage.addEventListener(MouseEvent.MOUSE_MOVE, peekOff);

function peekOff (e:MouseEvent):void {
        if (MovieClip(root).mouseY <= LDSroot.y-44) {
        trace("true")
        gotoAndStop(2);   //the "worpan" playhead should go to frame 2 
        LDSroot.visible=false;  //the e.target movieclip should dissappear
        MovieClip(root).LD2nd.alpha=1;
        }
}