Highlight Box

Hello.

I have a flash movie where I want to have the ability to highlight text. I have a movie clip of a 50% yellow transparent box using the following code:

box.onMouseDown = function() {
	this._x = _root._xmouse;
	this._y = _root._ymouse;
	this._xscale = this._yscale=0;
	this._visible = true;
	this.onMouseMove = function() {
		this._xscale = _root._xmouse-this._x;
		this._yscale = _root._ymouse-this._y;
		updateAfterEvent();
	};
};
box.onMouseUp = function() {
	delete this.onMouseMove;
	this._visible = true;
}
}

This works great, but I need to be able to draw more than one highlight box, and I need these boxes to attach themselves to a specifc mc so that they move along with it. Hope this makes sense. Any help would be much appreciated.