UPDATE php Problem

Får denne fejl.
Notice: Undefined variable: indhold in **URL** on line 5 Notice: Undefined variable: baner in **URL** on line 5

Her er form koden:
<?php
       
$type=$_GET['type'];
       

$conn = mysqli_connect(xxxxxCENSURxxxxx) or die (mysqli_error($conn));


$query = "SELECT * FROM ".$type." WHERE id=".$_GET['id']."";       
while ($resultat=mysqli_query($conn, $query)); {

        ?>
    <center>
            <form action="edit/entersites.php?type=<?php echo "$type"; ?>&id=<?php echo $_GET['id']; ?>" method="post">
    <table>     
    <tr>
      <td>Forsiden:</td
      ><td><textarea name="indhold" style="width:334px; height:200px;"><?php echo $row['indhold'] ?></textarea></td>
    </tr>
    <tr>
      <td>Baner:</td>
        <td><textarea name="baner" style="width:334px; height:200px;"><?php echo $row['baner'] ?></textarea></td>
    </tr>
    <tr>
    <td> <input type="submit" name="submit" value="Gem rettelse" /></td>
    </tr>
    </table>
            </form>
    </center>
   
<?php
}
mysqli_close($conn);
?>



Her er UPDATE koden:

<?php

$conn = mysqli_connect(xxxxxxxxxCENSURxxxxxxxxxx) or die (mysqli_error($conn));

mysqli_query($conn, "UPDATE golf SET indhold = '$indhold, baner = '$baner'");

mysqli_close($conn);
echo 'Alt er rettet. <br /><br /><a href="../admin.php.php">Admin siden</a>';
exit();
?>