[MySQL + PHP] Delete su piu tabelle

[Sbarboff2005]

Ciao non riesco a cancellare su piu tabelle dove sbaglio:

if(isset($_GET['del']) && $_GET['del'] >= ""){
        $userid = $_GET['del'];
        $del_sql = "DELETE FROM ftpuser, ftpquotalimits, ftpquotatallies WHERE ftpuser.userid = ftpquotalimits.name AND ftpuser.userid = ftpquotatallies.name AND ftpuser.userid = '$userid'";
        $del_query = mysql_query($del_sql) or die (mysql_error());
        echo "cancella : ". $_GET['del'] . "
" . $del_sql;
} 

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 'WHERE ftpuser.userid = ftpquotalimits.name AND ftpuser.userid = ftpquotatallies.' at line 1