[Fatality]

var a:Array = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100];
var num:Number = -1;
listner = new Object();
listner.onKeyDown = function() {
	if (Key.isDown(Key.RIGHT)) {
		if(num < a.length - 1) trace(a[++num]);
	}
	if (Key.isDown(Key.LEFT)) {
		if(num > 0) trace(a[--num]);
	}
};
Key.addListener(listner);