Exécuter les instructions SQL directement et à partir d'un textarea

INSERT DELAYED IGNORE INTO `jos_sections` VALUES(1000, 'Recettes', '', 'recettes', '', 'content', 'left', '', 1, 0, '2010-08-05 01:01:01', 6, 0, 57, '');

<form action="" method="post" name="form1">
<table>
<tr><td>
 
<p><textarea name="text_all" rows="9" cols="100"></textarea></p>
 
<input type="submit" name="submit">
</td></tr>
</table>
</form>

<?php
if (isset($_POST['submit'])) {
$link = mysql_connect("localhost","root","");
$db_selected = mysql_select_db('didine_site', $link);


$var_text_all  = $_POST['text_all'];
$var_text_all = str_replace('\r\n','<br />',$var_text_all); 
$sql = $var_text_all;
// on envoie la requête
$req = mysql_query($sql) or die('Erreur SQL !<br>'.$sql.'<br>'.mysql_error());
  if($req)
  {
    echo("La modification à été correctement effectuée") ;
  }
  else
  {
    echo("La modification à échouée") ;
  }
mysql_close();
}
?>

$sql = stripslashes($var_text_all);

UPDATE jos_content SET title='toto2' WHERE id=10000;

UPDATE jos_content SET title='toto2' WHERE id=10000;
UPDATE jos_content SET title='toto1' WHERE id=10001;

UPDATE jos_content SET title='toto2' WHERE id=10000; UPDATE jos_content SET title='toto1' WHERE id=10001;
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UPDATE jos_content SET title='toto1' WHERE id=10001' at line 2

$sql = stripslashes($var_text_all);