come eliminare una foto

[prinzart]

ciao, ho realizzato una fotogallery, ora però non riesco a far funzionare il pulsante elimina foto sia dal db, sia dalla directory dove risiede fisicamente l'immagine:

 <form enctype="multipart/form-data" name="deletefoto" action="<?=$PHP_SELF?>" method="post">  
<table width="100%"  border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
                                  
                                  <?php 
                                $i=1;


$sqlgallery2 = "SELECT a_photogallery.*
                  FROM a_photogallery 
                  WHERE a_photogallery.id_login = '$login'
                ORDER BY id_photogallery DESC";
$resultgallery2 = mysql_query($sqlgallery2,$conn) or die ("errore ".mysql_error());

                                while($rowgallery2 = mysql_fetch_array($resultgallery2)){
                                ?>
                                <?php
                                if ($i==1){ echo "<tr align=\"center\" valign=\"top\">";
                                } 
                                ?>
                    <td align="center">
                       
<table width="10" height="10" border="0" cellpadding="5" cellspacing="0">
  <tr>
    <td>[img]../pann_contr_comune/images_photogallery_utenti/<?=$rowgallery2['foto_big']?>[/img]</td>
  </tr>
    <tr>
    <td align="center">
<input type="submit" name="submit" value="elimina"><input type="hidden" name="delete" value="<?=$rowgallery2['id_photogallery']?>"></td>
  </tr>
</table>



</td>
                        <?
                            if ($i==4){
                                echo "</tr><tr align=\"center\" valign=\"top\"><td height=\"6\"></td><td></td><td></td></tr>";
                                $i=0;
                            }
                             $i++;
                        }?>

                                </table>



<?
if ($delete){
$sql="DELETE FROM a_photogallery 
            WHERE a_photogallery.id_photogallery = '".$rowgallery2[id_photogallery]."'";
$query=mysql_query($sql);
$msgeliminato = "FOTO ELIMINATA";
}
?>        
</form>