var i = 0;
    while (typeof document.getElementById("sub_total_" + i) != "undefined") {
        var obj_sub_total = document.getElementById("sub_total_" + i);
        if (obj_sub_total != "undefined") {
            if (fr.order_method_id.value == 1) {
                obj_sub_total.style.visibility = "visble";
            } else {
                obj_sub_total.style.visibility = "hidden";
            }
        }
        i++;
    }