delete checkbox multiple

<?php
//sécurité
include("sources/secuk.php");
//Page du haut
include("sources/haut.php");
?>
<script language="javascript">
<!--
function cocheToute(){
   var taille = document.forms['del'].elements.length;
   var element = null;
   for(i=0; i < taille; i++){
      element = document.forms['del'].elements[i];
      if(element.type == "checkbox")
         element.checked = true;
   }
 
}
//-->
</script>
<br/><br/><div id="m1">
<table width="500" border="0" align="center" />
  <tr>
    <td>
      <table width="100%" border="0">
        <tr>
          <td>
            <div align="center"><font>Messagerie
               - Messages re&ccedil;us</font></b> </font></div>
          </td>
        </tr>
      </table><br/><br/>
<?php
//Premiere Page
if(@!$start) {$start=0;}
 
//Recupere le nombre de messages au total
@$result=mysql_query ("SELECT * FROM messages WHERE dest='".$_SESSION['xxxx']."' ORDER by date DESC, heure DESC LIMIT $start,$messpagerec") or die ("Requete impossible");
 
//Nombre de messages recuperer dans $nbmessrec
$nbmessrec = mysql_num_rows($result);
 
echo("<table width=\"100%\" border=\"0\">\n<tr>\n<td>\n");
echo("<div align=\"left\"><b>Messages ");
echo("re&ccedil;us :</font> <font color=\"#FF0000\">$nbmessrec</b></font><br>\n");
echo("<form method=\"post\" name=\"del\" action=\"\" >");
?>
<a href="javascript:cocheToute();"><img src="images/erreur.JPG" width="15" height="16" border="0" title="TOUT COCHER" /></a>
<input name="delete" type="submit" id="delete" value="Delete">
<?php
echo("</div>");
echo("</td>\n</tr>\n</table><hr>");
echo("<table width=\"100%\" border=\"0\">\n<tr>");
echo("<td width=\"10%\"><center><b>Effacer</b></center></td>\n");
echo("<td width=\"20%\"><center><b>Dates</b></center></td>\n");
echo("<td width=\"20%\"><center><b>Exp&eacute;diteur</b></center></td>\n");
echo ("<td width=\"50%\"><center><b>sujet</b></center></a></td>");
echo("</tr>\n</table>");
 
//Affichage des messages trier par l'affichage par page
while ($row = mysql_fetch_array($result)) {
 
$idmess = $row["id"];
$envmess = $row["env"];
$titremess = $row["titre"];
$datemess = $row["date"];
 
//Date version dd mm yyyy
list($y,$m,$d) = explode("-",$datemess);
$tiret= "-";
$datemess2 = $d.$tiret.$m.$tiret.$y;
echo("<table width=\"100%\" border=\"0\" bgcolor=\"#FFFFFF\">\n<tr>");
?>
<td width="10%"><input name="checkbox[]" type="checkbox" id="checkbox[]" value="<? echo $rows['id']; ?>"></td>
<?php
echo("<td width=\"20%\"><font color=\"#FF0000\"><center>$datemess2</center></font></td>\n");
echo("<td width=\"20%\"><center>$envmess</center></td>\n");
echo("<td width=\"50%\"><a href=\"message.php?aff=$idmess\"><center>$titremess</center></a></td>\n");
/*echo ("<td width=\"13%\"><a href=\"supmessagerie.php?suppr=$idmess\"><center>Effacer</center></a>");*/ 
echo("</tr>\n</table>");
}
if($delete){
for($i=0;$i<$count;$i++){
$del_id = $checkbox[$i];
$sql = "DELETE FROM messages WHERE id='$del_id'";
$result = mysql_query($sql);
}
 
// if successful redirect to delete_multiple.php
if($result){
echo "<meta http-equiv=\"refresh\" content=\"0;URL=messagerie.php\">";
}
}
mysql_close();
//Si il n'y a pas encore de message  recu
if ($nbmessrec=="") {
echo("<table width=\"100%\" border=\"0\" bgcolor=\"#FFFFFF\"><tr>");
echo("<td><i>Aucun message pour le moment</i>");
echo("</td></form></tr></table>");}
?>
</td></tr>
  <tr>
 <td>
<?php
//Barre de navigation (page précédente - page suivante)
//Affichage ou non de l'url page precedente
echo("<table width=\"100%\" border=\"0\" align=\"center\"><tr><td width=\"30%\">");
if($start>0){
echo("<a href=\"messagerie.php?start=".($start-$messpagerec)."\">&lt;&lt; Pr&eacute;c&eacute;dent</a>");}
if($nbmessrec>0){
echo("</td><td width=\"40%\"><div align=\"center\">Page ");
echo ($start + $messpagerec)/$messpagerec;
echo (" sur ");
echo ceil($nbmessrec/ $messpagerec);}
echo("</div></td><td width=\"30%\">");
//Affichage ou non de l'url Page suivante
if($nbmessrec>$start+$messpagerec){
echo("<div align=\"right\"><a href=\"messagerie.php?start=".($start+$messpagerec)."\">Suivant &gt;&gt;</a></div>");}
echo("</td>\n</tr>\n</table>\n");
?>
</td></tr>
    <tr>
    <td><hr>
    <table width="100%" border="0">
  <tr>
    <td><a href="envmessagerie.php?idm=<?php echo''.$_SESSION['idm'].''; ?>"><font>Messages envoy&eacute;s</font></a></td>
    <td><div align="right"></div></td>
  </tr>
</table>
     </td>
  </tr>
</table><br />
<div align="center">
<a href="compte.php?idm=<?php echo''.$_SESSION['idm'].''; ?>">Retour à votre compte</a></div></div>
<br />
<?php
mysql_close();
//Page du bas
include("sources/bas.php");
?>