_global.playAdelante = function(mc, frameIni, frameFin) {
	mc.frameActual = mc._currentframe;
	mc.frameIni = frameIni;
	mc.frameFin = frameFin;

	mc.onEnterFrame = function() {
		if (mc.frameActual < mc.frameFin) {
			mc.frameActual += 1;
			mc.gotoAndStop (mc.frameActual);
		} else {
			delete mc.onEnterFrame;
		}
	}
}

_global.playAtras = function(mc, frameIni, frameFin) {
	mc.frameActual = mc._currentframe;
	mc.frameIni = frameIni;
	mc.frameFin = frameFin;
	
	mc.onEnterFrame = function() {
		if (mc.frameActual > mc.frameIni) {
			mc.frameActual -= 1;
			mc.gotoAndStop (mc.frameActual);
		} else {
			delete mc.onEnterFrame;
		}
	}
}