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 );

  }

}

?>