var coup1="BREASTCC";
var coup2="MATCH09";
var coup3="LOVE10";

function CalculateOrder(form) {

 if (form.text1.value == coup1)
 {
 form.discount_rate.value = "50";
 form.discount_rate2.value = "50";
 form.on0.value = "Coupon";
 form.os0.value = "BREASTCC - Discount 50%";
 }
  if (form.text1.value == coup2)
 {
 form.discount_rate.value = "20";
 form.discount_rate2.value = "20";
 form.on0.value = "Coupon";
 form.os0.value = "MATCH09 - Discount 20%";
 }
  if (form.text1.value == coup3)
 {
 form.discount_rate.value = "15";
 form.discount_rate2.value = "15";
 form.on0.value = "Coupon";
 form.os0.value = "LOVE10 - Discount 15%";
 }
}