Rediger og slette ting fra en database

Kode 

<div class="indholdtabel"> <div class="indholdtekstboks"><br>
<span class="indholdoverskrift">Rediger nyheder:</span><br>
<br>
<?
include("db_connection.php");
$gem = $_REQUEST["overskrift"];
$gem1 = $_REQUEST["tekst"];
$gem2 = $_REQUEST["forfatter"];
$gem1 = nl2br($gem1);

$opdater = mysql_query("UPDATE nyheder SET overskrift = '$gem', tekst = '$gem1', forfatter = '$gem2' WHERE id = $id");
if ($_GET['action'] == 'opdater') { mysql_query("UPDATE nyheder SET overskrift = '$gem', tekst = '$gem1', forfatter = '$gem2' WHERE id = $_GET[id]"); }

$slet = mysql_query("DELETE from nyheder WHERE id = $id");
if ($_GET['action'] == 'slet') { mysql_query("DELETE from nyheder WHERE id = $_GET[id]"); }
      $result = mysql_query("SELECT * FROM nyheder ORDER BY id DESC");
      while ($data = mysql_fetch_array($result))
{
?>
<form action="index.php?side=rediger_nyheder&action=opdater&id=<? echo "$data[id]"; ?>" method="post" name="<? echo "$data[id]"; ?>" style="margin: 0px;">
<table width="540" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td colspan="2" class="rediger_nyhed"><span class=standardstyle><strong>Nyhedens nummer:</strong> <? echo "$data[id]"; ?></span></td>
  </tr>
     <tr>
    <td colspan="2" class="rediger_nyhed"><span class=standardstyle><strong>Overskrift:</strong></span></td>
  </tr>
     <tr>
    <td colspan="2"><span class=standardstyle><textarea name="overskrift" cols="87" rows="1"><? echo "$data[overskrift]"; ?></textarea></span></td>
  </tr>
     <tr>
    <td colspan="2" class="rediger_nyhed"><span class=standardstyle><strong>Nyheden:</strong></span></td>
  </tr>
     <tr>
    <td colspan="2" class="rediger_nyhed"><span class=standardstyle><textarea name="overskrift" cols="87" rows="20"><? echo "$data[tekst]"; ?></textarea></span></td>
  </tr>
   <tr>
    <td width="50%" class="rediger_nyhed_fed"><input name="submit" type="submit" value="Gem ændringer"></form></td>
<td width="50%" class="rediger_nyhed_fed"><form action="index.php?side=rediger_nyheder&action=slet&id=<? echo "$data[id]"; ?>" method="post" name="<? echo "$data[id]"; ?>" style="margin: 0px;"><input name="submit" type="submit" value="Slet nyhed"></form></td>
   </tr>
</table>
<br>
<? } ?>
</div>
</div>