external actionscripts question

How do I change and combine the following .as file and .fla file into a single .fla....i've tried various ways but none of them seem to work....any help will be appriciated.


I have a listbox movie clip with an instance name of people_lb in the .fla and the movie clips name is SimpleChat as well as this code.

// a random username
var username = "user_" + getTimer();

// simplechat is a MovieClip on stage and is linked to the SimpleChat class
simplechat.connect("rtmp:/simplechat", username);


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The following code is the external action script(.as).....

import mx.utils.Delegate;
import mx.controls.List;

class SimpleChat extends MovieClip
{

private var people_lb:List;

public var _username:String; // passed in to the connect method

private var _nc:NetConnection;
private var _chatSO:SharedObject;





// sets up the NetConnection
public function connect( rtmpString:String, username:String )
{

// let's save a reference to the username
_username = username;

_nc = new NetConnection();
_nc.owner = this;
_nc.onStatus = function ( info )
{
//trace(info.code);
if(info.code == "NetConnection.Connect.Success")
{
trace("connected successfully");
// now we can hook up the SharedObject
this.owner.connectSO( this );
}
}

// let's connect
_nc.connect(rtmpString, _username);

}

private function connectSO( nc )
{
// get a reference to a non-persistent remote SharedObject called 'chat_so'
_chatSO = SharedObject.getRemote("chat_so", nc.uri, false);

// Delegate the SharedObject onSync to onChatSOSync
_chatSO.onSync = Delegate.create(this, onChatSOSync);


// connect the SharedObject - often gets forgotten but rather important 😉
_chatSO.connect( nc );

}

private function onChatSOSync ( list )
{
// clear the peoplelist
people_lb.removeAll();

// iterate over all the data 'slots' in the SharedObject
for (var i in _chatSO.data)
{
if (_chatSO.data != null)
{
// this is the client object as stored by the server within application.onConnect
var clientObj = _chatSO.data;
// add each user
people_lb.addItem({label:clientObj.username, data:clientObj});
}
}
};

} // class ends