var coup1="GOLD40";


function CalculateOrder(form) {

 if (form.text1.value == coup1)
 {
 form.discount_rate.value = "40";
 form.discount_rate2.value = "40";
 form.on0.value = "Coupon";
 form.os0.value = "GOLD40 - Discount 40%";
 }

}