Hola El_derby:
Escribe así el código:
Código actionscript:
Ver originalscrolledMC.setMask(mask);
buttonUp._visible = false;
buttonDown._visible = false;
ControllButton = true;
contentSizeStep = -250;
scrollPozition = "scrollY";
mouseSpeed = 5;
speedContent = 80;
stepContent = 2;
step = 1;
delayScroll = 4;
if (ControllButton && buttonUp._alpha>0 && buttonDown._alpha>0) {
buttonUp._visible = true;
buttonDown._visible = true;
} else {
buttonUp._visible = false;
buttonDown._visible = false;
}// end else if
stop();
Espero haberte sido de ayuda.