function move () {
	var nextTime = getTimer ();
	var diffTime = nextTime - startTime;
	if (diffTime >= 1000) {
		var startTime = getTimer ();
		this._x += 5;
		if (this._x >= 100) {
			delete this.onEnterFrame;
		}
	}
}
stop ();

b_mc.onEnterFrame = move;
c_mc.onEnterFrame = move;
d_mc.onEnterFrame = move;
a_mc.onEnterFrame = move;