Código PHP:
if ((isset($_GET['id'])) && ($_GET['id'] != "")) {
$deleteSQL = sprintf("DELETE FROM productos WHERE id_produc=%s",GetSQLValueString($_GET['id'], "int"));
$deleteSQL1 = sprintf("DELETE FROM produc_in WHERE id_produc=%s",GetSQLValueString($_GET['id'], "int"));
$deleteSQL2 = sprintf("DELETE FROM produc_cas WHERE id_produc=%s",GetSQLValueString($_GET['id'], "int"));}