Calling session (user)

Hi guys,

I want to display the user name in the dynamic textfield on the login success page (new page) but it keeps giving me 'undefined'. What's the problem?

login.php

<?php

session_start();

$username = $_POST['username'];

$password = $_POST['password'];

$_SESSION['username'] = $username;

. //other codes

.

.

?>

adminPage.php (successpage)

<?php

session_start();

$_SESSION['username'] = $_POST['username'];

$username = $_GET['username'];

    print "session=$username";

            ?>

AS3

import flash.display.*;

import flash.events.*;

import flash.net.URLLoader;

import flash.net.URLRequest;

import flash.net.URLVariables;

import flash.net.URLLoaderDataFormat;

import flash.net.URLRequestMethod;

var phpVarsSession:URLVariables = new URLVariables();

var phpFileRequestSession:URLRequest = new URLRequest("adminPage.php");

phpFileRequestSession.method = URLRequestMethod.POST;

var phpLoaderSession:URLLoader = new URLLoader();

phpLoaderSession.dataFormat = URLLoaderDataFormat.VARIABLES;

phpLoaderSession.addEventListener(Event.COMPLETE, showSession);

phpVarsSession.user = user.text;

phpFileRequestSession.data = phpVarsSession;

phpLoaderSession.load(phpFileRequestSession);

function showSession(event:Event):void

{ 

user.text = "" + event.target.data.session;

}