MovieClip.prototype.tweenTo = function(targetsObj, speed) {
	// init broadcaster
	if (!this.broadcastMessage) {
		AsBroadcaster.initialize(this);
	}
	this.targetsObj = targetsObj;
	this.speed = speed;
	// loop onEnterFrame
	this.onEnterFrame = function() {
		var count:Number = 0;
		// loop target objects
		for (var prop in this.targetsObj) {
			// change property value
			this[prop] += (this.targetsObj[prop]-this[prop])/this.speed;
			// if property == target
			if (Math.abs(this.targetsObj[prop]-this[prop])<.5) {
				this[prop] = this.targetsObj[prop];
				delete this.targetsObj[prop];
			}
			count++;
		}
		// if object is empty
		if (!count) {
			this.broadcastMessage("ready");
			delete this.onEnterFrame;
		}
	};
};