addChild to holder - CS3

[goodlie]

Hello;
I am a novice with CS3 and have a question.

I have the code below which is working fine. I would like to load this .swf to a holder on the stage (holder_mc), that is sized and positioned how I would like it.

Then I will have another button that I would like to removeChild() from the holder_mc.

Can someone help me with this?
Thank you.

import flash.events.MouseEvent;
import flash.display.MovieClip;
import flash.display.Loader;
import flash.events.*;
import flash.net.URLRequest;
var imageLoader:Loader = new Loader();
var theURL:String = "New4thfloorStar.swf";
var imageRequest = new URLRequest(theURL);
imageLoader.load(imageRequest);
FourthFloor_btn.addEventListener(MouseEvent.CLICK, FourthFloor_btn_Click);
function FourthFloor_btn_Click(event:MouseEvent):void
{
addChild(imageLoader.content);
}