Improving code how to?

programming flash
1

Hello i want to know, if is possible, how can i improve this code?:
Thanks


     // set listeners mainButtons

menu.nosotros.addEventListener(MouseEvent.MOUSE_DOWN, clickMain);

function clickMain(e:MouseEvent):void {

var ldr:Loader = new Loader();

var urlReq:URLRequest = new URLRequest(""+ e.target.name +".swf");

ldr.load(urlReq);

function loadHandler (e:Event) {

var myClip:MovieClip = e.target.content;

addChild(myClip);

///////////////////////////////////////////////////////////////

function clickSub(e:MouseEvent):void {

myClip.nosotrosmc.gotoAndStop("historia");

//myClip.islasmc.gotoAndStop(e.target.name);

}

menu.nosotros.addEventListener(MouseEvent.MOUSE_UP, clickSub);

}

// listener

ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, loadHandler);

}

And another question, how to remove the loaded file, if i add more files ?

thanks