nedd help getting count down timer to stop

[dawsonk]

var count:int = 2013;
var myTimer:Timer = new Timer(100,count);
myTimer.addEventListener(TimerEvent.TIMER, countdown);
myTimer.start();

function countdown(e:TimerEvent):void {
        myText_txt.text = String((count)-myTimer.currentCount);
        if (myText_txt.text == "1900") {
                myTimer.stop();
        }
}