var coup1="3CCCASH";
var coup2="BDAY25";
var coup3="GOLD20";

function CalculateOrder(form) {

 if (form.text1.value == coup1)
 {
 form.discount_amount.value = "50";
 form.discount_amount2.value = "50";
 form.on0.value = "Coupon";
 form.os0.value = "3CCCASH - Discount $50.00";
 }
  if (form.text1.value == coup2)
 {
 form.discount_amount.value = "25";
 form.discount_amount2.value = "25";
 form.on0.value = "Coupon";
 form.os0.value = "BDAY25 - Discount $25.00";
 }
  if (form.text1.value == coup3)
 {
 form.discount_rate.value = "20";
 form.discount_rate2.value = "20";
 form.on0.value = "Coupon";
 form.os0.value = "GOLD20 - Discount 20%";
 }
}