Opdaterer med $_SESSION['id'];

PHP kode 

 if($_GET['valg'] == "konto_andre") {
                 if($_POST['submit']) {
                     if($username == "") {
                         echo "Du skal udfylde <u>Øgenavn/login</u>.";
                     } else {
                         if($email == "") {
                             echo "Du skal udfylde <u>Email</u>.";
                         } else {
                             if($steam_id == "") {
                                 echo "Du skal udfylde <u>Steam ID</u>.";
                             } else {
                                 if($fullname == "") {
                                     echo "Du skal udfylde <u>Fulde navn</u>.";
                                 } else {
                                     if($age == "") {
                                         echo "Du skal udfylde <u>Alder</u>.";
                                     } else {
                                         if($land == "") {
                                             echo "Du skal udfylde <u>Land</u>.";
                                         } else {
                                             $session_id = $_SESSION['id'];
                                             $username = $_POST['username'];
                                             $email = $_POST['email'];
                                             $steam_id = $_POST['steam_id'];
                                             $fullname = $_POST['fullname'];
                                             $age = $_POST['age'];
                                             $land = $_POST['land'];
                                             mysql_query("UPDATE user SET username='$username', email='$email', steam_id='$steam_id', fullname='$fullname', age='$age', land='$land' WHERE id='$session_id'");
                                             echo "Din bruger er blevet opdateret!";
                                         }
                                     }
                                 }
                             }
                         }
                     }
                 }
                 if(isset($_SESSION['user']) && isset($_SESSION['user_level'])) {
                     $session_id = $_SESSION['id'];
                     $user = mysql_query("SELECT * FROM user WHERE id = '$session_id'");
                     $row = mysql_fetch_array($user, MYSQL_ASSOC);
                     ?>
                     <form action='konto_andre' method='POST'>
                         <table width='90%'>
                             <tr>
                                 <td colspan='2'>
                                     <h2>Ændre profil</h2><hr>
                                 </td>
                             </tr>
                             <tr>
                                 <td width='50%'>
                                     Øgenavn/login:
                                 </td>
                                 <td width='50%'>
                                     <input type='text' name='username' value='<?php echo $row['username']; ?>'>
                                 </td>
                             </tr>
                             <tr>
                                 <td width='50%'>
                                     Email:
                                 </td>
                                 <td width='50%'>
                                     <input type='text' name='email' value='<?php echo $row['email']; ?>'>
                                 </td>
                             </tr>
                             <tr>
                                 <td width='50%'>
                                     Steam ID
                                 </td>
                                 <td width='50%'>
                                     <input type='text' name='steam_id' value='<?php echo $row['steam_id']; ?>'>
                                 </td>
                             </tr>
                             <tr>
                                 <td width='50%'>
                                     Fulde Navn:
                                 </td>
                                 <td width='50%'>
                                     <input type='text' name='fullname' value='<?php echo $row['fullname']; ?>'>
                                 </td>
                             </tr>
                             <tr>
                                 <td width='50%'>
                                     Alder:
                                 </td>
                                 <td width='50%'>
                                     <input type='text' name='age' value='<?php echo $row['age']; ?>'>
                                 </td>
                             </tr>
                             <tr>
                                 <td width='50%'>
                                     Land:
                                 </td>
                                 <td width='50%'>
                                     <input type='text' name='land' value='<?php echo $row['land']; ?>'>
                                 </td>
                             </tr>
                                 <td>
                                     <input type='submit' name='submit' value='Opdater!'>
                                 </td>
                             <tr>
                         </table>
                     </form>
                 <?php
                 } else {
                     header("Location: nyheder");
                 }
             }