[dimarik]

как-то так я бы сделал

var app:Object = this;

var arrayKnopok:Array = new Array();

function whatKnopkaIsPressed(mc:MovieClip):Void {
	trace('knopka ' + mc + ' was pressed and it index is: ' + mc.num);
	var pressedKnopaIndex:Number = Number(mc.num);
	// some your code here like
	// this.arrayKnopok[pressedKnopaIndex]
}

for (var i:Number = 0; i < 10; i++) {
	this.attachMovie("kn", "kn" + i, i);
	this["kn"+i]._y = i * 30;
	this.num = i;
	this["kn" + i].onPress = function() {
		app.whatKnopkaIsPressed(this);
	};
}