fillBackground

	/**
	 * Fills a supplied MovieClip with a specific width, height, color, and opacity
	*/
	private function fillBackground(_obj:MovieClip, _w:Number, _h:Number, _color, _opacity:Number):Void
	{
		_obj.beginFill( _color, _opacity );
		_obj.moveTo(0, 0);
		_obj.lineTo(_w, 0);
		_obj.lineTo(_w, _h);
		_obj.lineTo(0, _h);
		_obj.lineTo(0, 0);
		_obj.endFill();
	};