CAN


                if ($_POST['act'] == "delete")
                {
                        $sql = "DELETE FROM zrfw4_dev WHERE zmid='$zmid' AND dev_mac='$mac';";
                }
                if ($_POST['act'] == "update")
                {
                        $sql = "UPDATE zrfw4_dev SET friendly_name='$friendly_name', dev_id='$dev_id' WHERE zmid='$zmid' AND dev_mac='$mac';";
                }


BE REPLACED BY:

$sql=($_POST['act']=="delete")?"DELETE FROM zrfw4_dev WHERE zmid='$zmid' AND dev_mac='$mac';":"UPDATE zrfw4_dev SET friendly_name='$friendly_name', dev_id='$dev_id' WHERE zmid='$zmid' AND dev_mac=;$mac';";

I receive parse error...