(AS3)value from one function to another in same class

programming
1

Hello, how do I get the value M (received from another class through the setter. I know I get it because the trace gives me the value) to the MovieLoader function. The answers probably in front of my nose, but I just can’t see it.

package {

import flash.display.MovieClip;
import flash.events.Event;
import flash.display.Loader;
import flash.net.URLRequest;
import flash.events.ProgressEvent;

public class MovieLoader extends MovieClip {

    public function MovieLoader() {
        var M:String;
        var imageReq:URLRequest=new URLRequest(M+".swf");
        var imageLoader:Loader = new Loader();
        imageLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadHandler);
        imageLoader.load(imageReq);
    }

    public static function set scenePlay(M:String):void {
        trace(M);
    }

    public function loadHandler(event:Event) {
        var scene:MovieClip=event.target.content;
        addChild(scene);
        scene.stop();
    }
}

}

Thanks for any help!!!