Frame gotoAndStop AS3 troubles

Question

I am having trouble linking a frame to another one. Actually it does work, but frame 2 (or 3 or 4) is corrupted by content from frame 1.
Frame 1 contains 3 buttons, and each is linked to frame 2, 3 and 4 via a gotoandstop function, respectively. In addition each buttons have rollover state that show up in front of everything when moused over. So I have generated the following script for my "to top" and a "gotoAndStop" functions on the same actions layer  (fla.file enclosed)
My problem is that when I click on button 1, it does take me to frame 2, but content from frame 1 also shows up on frame 2, I have the same problem when I go to frame 3 or frame 4.... Now if I remove the "to top" function from my action layer, I do not have any problem at all ...
Can anybody help me here
Many many thanks
A newbie here

Answer 1

then use:
btn1.addEventListener(MouseEvent.ROLL_OVER,toTop);
btn2.addEventListener(MouseEvent.ROLL_OVER,toTop);
btn3.addEventListener(MouseEvent.ROLL_OVER,toTop);
function toTop(evt:MouseEvent):void {
    addChild(SimpleButton(evt.currentTarget));
stop();
btn1.addEventListener(MouseEvent.CLICK, mouseClickHandler);
btn2.addEventListener(MouseEvent.CLICK, mouseClickHandler);
btn3.addEventListener(MouseEvent.CLICK, mouseClickHandler);
function mouseClickHandler(event:MouseEvent):void {
   removeChild(btn1);
removeChild(btn2);
removeChild(btn3);
    gotoAndStop(event.currentTarget.name);