var coup1="8675309";


function CalculateOrder(form) {

 if (form.os1.value == coup1)
 {
 form.discount_amount.value = 5;
 form.discount_amount2.value = 5;
 form.on2.value = "Coupon";
 form.os2.value = "8675309 - Discount $5";
 }



}