Fading External SWFs using TweenLite

I set up a very basic fla with 3 bts and 3 dummy swfs. Each bt loads an swf into a mc called 'loadmc' an empty container on the stage and fades it in using greensock's TweenLite.

But i ran into a roadblock here. i want it to function like this:
a) load 1st swf
b) on click fade out 1st swf and load 2nd swf.. and so on..

here's the code:

Code:

---

import com.greensock.*;
import com.greensock.easing.*;
import com.greensock.plugins.*;
TweenPlugin.activate([AutoAlphaPlugin]);
import flash.net.URLRequest;
import flash.display.Loader;
import flash.events.Event;
import flash.events.ProgressEvent;
import flash.events.MouseEvent;

var loader:Loader = new Loader();
addChild(loader);

bt1.addEventListener(MouseEvent.CLICK,onLoadClick);

function onLoadClick(evt:MouseEvent):void
{
        loadmc.alpha = 0;
        loader.load(new URLRequest("loadtest1.swf"));
        loadmc.addChild(loader);
        TweenLite.to(loadmc, 0.8, {autoAlpha:1, ease:Sine.easeIn});


}

bt2.addEventListener(MouseEvent.CLICK, onLoadClick2);

function onLoadClick2(evt:MouseEvent):void
{
        loadmc.alpha = 0;
        loader.load(new URLRequest("loadtest2.swf"));
        loadmc.addChild(loader);
    TweenLite.to(loadmc, 0.8, {autoAlpha:1, ease:Sine.easeIn});
}

bt3.addEventListener(MouseEvent.CLICK, onLoadClick3);

function onLoadClick3(evt:MouseEvent):void
{
        loadmc.alpha = 0;
        loader.load(new URLRequest("loadtest3.swf"));
        loadmc.addChild(loader);
        TweenLite.to(loadmc, 0.8, {autoAlpha:1, ease:Sine.easeIn});
}

---

i did not use an array because the loading swfs are totally upon the user.

i am thinking, i need a second empty container (loadmc2?) and fade the 2 with each other while loading, but my as3 knowledge is basic as i am still learning.

any help would be appreciated, thanks.