function populateBilling() {
    document.myform.Billing_Address.value = document.myform.Service_Address.value;
    document.myform.Billing_City.value = document.myform.Service_City.value;
    document.myform.Billing_Zip.value = document.myform.Service_Zip.value;
    document.myform.Billing_State.value = 'CA';

}