おおきさんは書きました：
・・なぜ、sampleのように動かないのか、まずは、この記述を読解できなければゴールへは辿り着けませんね、、

_root に、ムービークリップ(インスタンス名: card, thumb1?thumb5) を配置。
card は、5フレーム。各フレームに、画像を配置して、stop();を記述。

for (var n:Number = 1; n <= 5; n++) {
	var _btn:MovieClip = this["thumb"+n];
	_btn.id = n;
	_btn.onRelease = function():Void {
		closeCard(this.id);
	};
}

var angle:Number = 10;
function closeCard(id:Number):Void {
	card.rotation = 0;
	card.onEnterFrame = function():Void {
		this.rotation += angle;
		var radian:Number = setDegreeToRadian(this.rotation);
		this._xscale = Math.cos(radian)*100;
		if (this.rotation >= 90) {
			this.rotation = 90;
			delete this.onEnterFrame;
			openCard(id);
		}
	};
}
function openCard(id:Number):Void {
	card.gotoAndStop(id);
	card.rotation = 90;
	card.onEnterFrame = function():Void {
		this.rotation -= angle;
		var radian:Number = setDegreeToRadian(this.rotation);
		this._xscale = Math.cos(radian)*100;
		if (this.rotation <= 0) {
			this.rotation = 0;
			delete this.onEnterFrame;
		}
	};
}
function setDegreeToRadian(degree:Number):Number {
	var radianToDegree:Number = 180/Math.PI;
	var angle:Number = degree/radianToDegree;
	return angle;
}