[Action Script] MouseEvent works only once May,2012

Hi
Can someone please tell me why my MouseEvent only works the first time and after that it doesnt work anmore

Here's the code:

ActionScript Code: btn_start.addEventListener(MouseEvent.CLICK, startTheGame);                    }                function startTheGame(event:MouseEvent):void        {            trace("Start");            gotoAndStop(2);        }
thanks!

btn_start starts the game.
when the game is over (the player lost all his lives) I go to Frame 1 (this is where my start-button is) but the button doesnt work anymore.
MouseEvent works only once

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