var coup1="GABF";
var coup2="GOODFRIEND";
var coup3="ROCK102";
var coup4="FBOFFER";

function CalculateOrder(form) {

 if (form.text1.value == coup1)
 {
 form.discount_amount.value = "5";
 form.discount_amount2.value = "5";
 form.on0.value = "Coupon";
 form.os0.value = "Great American Beer Festival - $5 Discount";
 }
  if (form.text1.value == coup2)
 {
 form.discount_amount.value = "5";
 form.discount_amount2.value = "5";
 form.on0.value = "Coupon";
 form.os0.value = "Sorry - only $5 now that I lowered the price...";
 }
  if (form.text1.value == coup3)
 {
 form.discount_amount.value = "5";
 form.discount_amount2.value = "5";
 form.on0.value = "Coupon";
 form.os0.value = "ROCK102 - $5 Discount";
 }
  if (form.text1.value == coup4)
 {
 form.discount_amount.value = "0";
 form.discount_amount2.value = "0";
 form.on0.value = "Coupon";
 form.os0.value = "FBOFFER - $0 Discount";
 }
}