[lexa2000lexa]

вот так вы хотите

nextButtonMC.onRelease = function() {
	_root.mc_1.gotoAndStop(_root.mc_1._currentframe + 1)
 
};
nextButtonMC.onPress = function() { 
	clearInterval (interval);
}
ButtonMC.onRelease = function(){
	interval = setInterval(function(){nextButtonMC.onRelease()},1000)
}