как сделать нормальный таймер?

[zanull]

пример таймера с запуском и остановкой:

Timer = function(start){
	this.reset(start);
}
Timer.prototype.start = function(){
	if (this._pauseTime){
		this._startTime += getTimer() - this._pauseTime;
		this._pauseTime = 0;
	}else{
		this.reset(true);
	}
}
Timer.prototype.stop = function(){
	if (!this._pauseTime) this._pauseTime = getTimer();
}
Timer.prototype.reset = function(restart){
	this._startTime = getTimer();
	if (!this._startTime) this._startTime = 1;
	if (restart) this._pauseTime = 0;
	else this._pauseTime = this._startTime;
}

Timer.prototype.getTime = function(){
	if (this._pauseTime) return this._pauseTime - this._startTime;
	var gotTime = getTimer();
	if (!gotTime) gotTime = 1;
	return gotTime - this._startTime;
}
Timer.prototype.setTime = function(t){
	this._startTime = getTimer() - t;
}
Timer.prototype.addProperty("time",Timer.prototype.getTime,Timer.prototype.setTime);

Timer.prototype.getPaused = function(){
	return (this._pauseTime) ? true : false;
}
Timer.prototype.setPaused = function(p){
	if (p == Boolean(this._pauseTime)) return false;
	if (p) this.stop();
	else this.start();
}
Timer.prototype.addProperty("paused",Timer.prototype.getPaused,Timer.prototype.setPaused);

function formatTime(milliseconds){
	var centiseconds = Math.floor(milliseconds/10);
	var seconds = Math.floor(centiseconds/100);
	var minutes = Math.floor(seconds/60);
	
	centiseconds %= 0;
	seconds %= 60;
	minutes %= 60;
	
	if (centiseconds < 10) centiseconds = "0" + centiseconds;
	if (seconds < 10) seconds = "0" + seconds;
	if (minutes < 10) minutes = "0" + minutes;
	
	return minutes +":"+ seconds +""+ centiseconds;
}


var clock_timer = new Timer();
clock_timer.start();


this.onEnterFrame = function(){
	display_txt.text = formatTime(clock_timer.time);
}

stop_btn.onRelease = function(){
	clock_timer.stop();
}

play_btn.onRelease = function(){
	if (clock_timer.paused) clock_timer.start(); // only start if paused
}

display_txt - имя текстового поля