Fazer função de class parar

Olá Galera

Tenho o codigo que realiza o movimento de camadas.

Como faço um botão que pare a o movimento realizado pela class?

Talvez parando a função...

class TelaPrincipal
{

 var _alvo, camada0, teste, camada1, camada3, camada4, camada5, camada6, _parent, width, wRect, hRect, mouseX, xRect, yRect, ret, scrollRect;
 function TelaPrincipal(alvo)
 {
 _alvo = alvo;
 camada3 = _alvo.camada3;
 camada5 = _alvo.camada5;
 camada3.limite = new flash.geom.Rectangle(0, 0, 2560, 600);
 camada5.limite = new flash.geom.Rectangle(0, 0, 2090, 600);
 this.moverCamadas(3);
 this.moverCamadas(5);
};

 function dispatchEvent()
 {
 } // End of the function
 function addEventListener()
 {
 } // End of the function
 function removeEventListener()
 {
 } // End of the function

	function moverCamadas(id)
 {
 var camada = this["camada" + id];
 camada.alvo = _alvo;
 camada.xRect = 0;
 camada.yRect = 0;
 camada.wRect = Stage.width;
 camada.hRect = camada._height;
 camada.width = camada.limite.width;
 camada.ret = new flash.geom.Rectangle(camada.xRect, camada.yRect, camada.wRect, camada.hRect);
 camada.mouseX = 0;
 camada.onEnterFrame = function ()
 {
 if (width < Stage.width)
 {
 width = Stage.width;
 } // end if
 wRect = Stage.width;
 hRect = camada._height;
 mouseX = mouseX + (_level0._xmouse - mouseX) * 1.500000E-001;
 var _loc2 = mouseX / wRect * 100;
 xRect = _loc2 * (width - wRect) / 100;
 ret = new flash.geom.Rectangle(xRect, yRect, wRect, hRect);
 scrollRect = ret;
 };
 } // End of the function
 var CLICK_CLUBIBINHO = "clickClubinho";

} // End of Class