[AS3][TUTORIAL] How to replace background map with image

package _02t
{
    import flash.display.Sprite;

    public class _lM_ extends Sprite
    {

        public function _lM_()
        {
            var local1:background = new background();
            local1.alpha = 1;
            local1.scaleX = (800 / local1.width);
            local1.scaleY = (600 / local1.height);
            addChild(local1);
        }
    }
}//package _02t

package _02t
{
import flash.display.Sprite;
import com.company.assembleegameclient.ui._zX_;

public class _R_f extends Sprite
{

    public function _R_f()
    {
        addChild(new _pM_());
        addChild(new _lM_());
        addChild(new _zX_());
    }
}
}//package _02t

package
{
import m*****re.*;

[Embed(source="background.png")]
public class background extends m*****re.BitmapAsset
{
    public function background()
    {
        super();
        return;
    }
}
}