Accessing session variables PHP

I am trying to access a session variable from a log in form (using the Log In User Server Behavior) and am lost. I simply want to display the users information in the target page. I read in another discussion that I had to bind the variable to the target page, which I did, but that didn't fix it.
Please help.
Here is my loginFormAction code:
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
session_start();
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
$_SESSION['PrevUrl'] = $_GET['accesscheck'];
if (isset($_POST['email'])) {
$loginUsername=$_POST['email'];
$password=$_POST['password'];
$MM_fldUserAuthorization = "";
$MM_redirectLoginSuccess = "owner.php";
$MM_redirectLoginFailed = "register.php";
$MM_redirecttoReferrer = false;
mysql_select_db($database_petriever, $petriever);
$LoginRS__query=sprintf("SELECT email, password FROM owners WHERE email=%s AND password=%s",
    GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text"));
$LoginRS = mysql_query($LoginRS__query, $petriever) or die(mysql_error());
$loginFoundUser = mysql_num_rows($LoginRS);
if ($loginFoundUser) {
     $loginStrGroup = "";
    //declare two session variables and assign them
    $_SESSION['MM_Username'] = $loginUsername;
    $_SESSION['MM_UserGroup'] = $loginStrGroup;
    if (isset($_SESSION['PrevUrl']) && false) {
      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];
    header("Location: " . $MM_redirectLoginSuccess );
else {
    header("Location: ". $MM_redirectLoginFailed );
?>

Wherever you want to display the logged-in username simply place this on the first line of a .php page to start the session:
<?php session_start(); ?>
Then place this code wherever you want to display the username:
<?php echo $_SESSION['MM_Username']; ?>

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Accessing session variables with php

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I am developing an application using STRUTS MVC...
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Message was edited by:
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$LoginRS__query=sprintf("SELECT firstname, surname FROM web_access WHERE firstname=%s AND surname=%s",
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