update all rows at the same time, same field, how?

[error_22]

Hi, I have a small problem. I made a form to update serveral id's at the same time. Im looking to update the same field.

PHP Code:

echo "<form action='page.php?action=order' method='POST'>";
$sql = "SELECT * FROM `page` ORDER BY `order` DESC";
    $result = mysql_query($sql) or die(mysql_error());
    while ($row = mysql_fetch_object($result))
{
echo "<input type='text' name='order' value='$row->order'>";
}
echo "<input type='submit' value='save'></form>"; 


in page.php?action=order:

PHP Code:

$sql = "UPDATE `page` SET order = '".$_POST['order']."'";
mysql_query($sql) or die(mysql_error()); 


Im clueless, any suggestions?

Thanks in advance
Niklas