[unleash]

This is my script at the moment

 maxTB = 2000;
minTB = 500;
flickerDuration = 1500;
flickerTime = getNewTime();

this.onEnterFrame = function() {
	curTime = getTimer();
	if (curTime>=flickerTime) {
		if (curTime<=flickerTime+flickerDuration) {
			if (cnt>=3) {
				flick._alpha = 60;
				cnt = 0;
			} else {
				flick._alpha = 100;
				cnt++;
			}
		} else {
			flick._alpha = 100;
		}
	}
};
function getNewTime() {
	return getTimer()+(Math.random()*(maxTB-minTB))+minTB;
}

//Button effect////
btn.onPress = function() {
	getURL("http://www.hvc.nl", "_blank");
};

...