var coup1="";
var coup2="SKINX20";
var coup3="BUZZ10";
var coup4="MAAS30";

function CalculateOrder(form) {

 if (form.text1.value == coup1)
 {
 form.discount_amount.value = "0";
 form.discount_amount2.value = "0";
 form.on1.value = "Coupon";
 form.os1.value = "EVITA10 = Discount 10%";
 }
  if (form.text1.value == coup2)
 {
 form.discount_amount.value = "20";
 form.discount_amount2.value = "0";
 form.on1.value = "Coupon";
 form.os1.value = "EVITA20 = Discount 20%";
 }
  if (form.text1.value == coup3)
 {
 form.discount_amount.value = "10";
 form.discount_amount2.value = "0";
 form.on1.value = "Coupon";
 form.os1.value = "EVITAsub = Discount 10%";
 }
  if (form.text1.value == coup4)
 {
 form.discount_amount.value = "30";
 form.discount_amount2.value = "0";
 form.on1.value = "Coupon";
 form.os1.value = "MAAS30 = Discount 30%";
 }
}