New to AS3

Question

I have created a flash document with 5 frames.
I have created a button called my_button.
I have the following code on the first frame:
import flash.events.MouseEvent;
this.my_button.addEventListener(MouseEvent.CLICK,clickthat);
function clickthat (event:MouseEvent):void {
gotoAndStop(5);
stop();
and the following code on frame 5:
import flash.events.MouseEvent;
this.my_button.addEventListener(MouseEvent.CLICK,clickthis);
function clickthis (event:MouseEvent):void {
gotoAndStop(1);
stop();
When I preview this, the button on frame 1 only works once,
when I click on the button in frame 5, it goes back to frame 1 like
it is supposed to, but clicking on the button in frame one doesn't
work anymore. Am I missing something here? Thanks for your
patience.

Answer 1

that's pretty poor design but if that's the way you
understand flash you can patch your problem by removing the old
listeners that you no longer want to use before you define the new
ones.
p.s. if you needed to use an import statement, one would be
enough. in your situation you need no import statements, at
all.