var coup1="JUNEBUG";
var coup2="save20";
var coup3="take25";

function CalculateOrder(form) {

 if (form.text1.value == coup1)
 {
 form.discount_rate.value = "25";
 form.discount_rate2.value = "25";
 form.on0.value = "Coupon";
 form.os0.value = "JUNEBUG - Discount 25%";
 }
  if (form.text1.value == coup2)
 {
 form.discount_rate.value = "20";
 form.discount_rate2.value = "20";
 form.on0.value = "Coupon";
 form.os0.value = "save20 - Discount 20%";
 }
  if (form.text1.value == coup3)
 {
 form.discount_rate.value = "25";
 form.discount_rate2.value = "25";
 form.on0.value = "Coupon";
 form.os0.value = "take25 - Discount 25%";
 }
}