Query MySQL table from login form.

Probably a simple question, but I can't seem to get it. Here my
my table on MySQL
ID        Username        UFN           ULN             Password
1         joSmith            John           Smith           encrypted
2         jaSmith            Jane           Smith           encrypted
3         jDoe                 John           Doe             encrypted
When I login using username and password, I want to display the first name and last name for the user and display it on the next page. I can usually echo a _POST, but when it comes to sessions, this doesn't seem to work properly, as the next page doesn't know the variable.

Sorry here is the code, its generated from the login user wizard from dreamweaver. It doesn't matter what code is on the second page as the session and post variables are "gone", I can't call on it. This code of course will successfully login to the restricted pages without issues.
<?php require_once('Connections/UserAcc_mySQL.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
$theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
return $theValue;
?>
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
session_start();
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
$_SESSION['PrevUrl'] = $_GET['accesscheck'];
if (isset($_POST['username'])) {
$loginUsername=$_POST['username'];
$password=md5($_POST['password']);
$UN=$_POST['usern'];
$MM_fldUserAuthorization = "";
$MM_redirectLoginSuccess = "loginredirect.php";
$MM_redirectLoginFailed = "adminlogin.php";
$MM_redirecttoReferrer = false;
mysql_select_db($database_UserAcc_mySQL, $UserAcc_mySQL);
$LoginRS__query=sprintf("SELECT `User`, Password, UFN, ULN FROM username WHERE `User`=%s AND Password=%s",
    GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text"));
$LoginRS = mysql_query($LoginRS__query, $UserAcc_mySQL) 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 );
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style>
.Login
position:absolute;
vertical-align:middle;
margin-left: 40%;
margin-right: 40%;
top: 153px;
</style>
</head>
<body>
<div class="Login">
<form ACTION="<?php echo $loginFormAction; ?>" method="POST" name="LogMeIn">
<label>Username:</label> <input type="text" name="username" id="username" /><br />
<label>Password: </label><input type="password" name="password" /><br />
<input type="hidden" name="user" />
    <input type="submit" value="Login" />
</form>
</div>
</body>
</html>

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