function xSetAnimation(_mc) {
    _mc.speed = speed;
    _mc.accel = accel;
    _mc.boundPos = boundPos;
    _mc.onEnterFrame = bound;
}

function xSetAnimation(_mc) {
    // ...[中略]...
    _mc.onEnterFrame = function() {  // 毎回functionが作成される
	// ...[後略]...

// MovieClip: クリックで水平移動のアニメーションさせる
// 第1フレームアクション
var nTarget:Number;
this.onRelease = function():Void  {
	nTarget = this._x+100;
	this.onEnterFrame = xEaseOut;
};
function xEaseOut():Void {
	var nDistance = (nTarget-this._x);
	if (Math.abs(nDistance)<0.5) {
		this._x = nTarget;
		delete this.onEnterFrame;
	} else {
		this._x += nDistance*0.2;
	}
	trace(this._x);
}