var couponid1="WWMAG";
// var couponid2=""; for addt'l coupons
// var couponid3="";

function CalculateOrder(form) {

 if (form.couponid.value == couponid1)
 {
 form.discount_rate.value = "40";
 form.discount_rate2.value = "40";
 form.on1.value = "Coupon Discount";
 form.os1.value = "WWMAG - Discount $2.00";
 }
  if (form.couponid.value == couponid2)
 {
 form.discount_rate.value = "";
 form.discount_rate2.value = "";
 form.on1.value = "";
 form.os1.value = "";
 }
  if (form.couponid.value == couponid3)
 {
 form.discount_rate.value = "";
 form.discount_rate2.value = "";
 form.on1.value = "";
 form.os1.value = "";
 }
}