function onBillLoad() {
        document.getElementById('address_invoice').style.visibility="hidden";  
   }
    function onBill() {
        
       if (document.getElementById('invoice_or_bill').value=='Paragon') {
           document.getElementById('address_invoice').style.visibility="hidden";  
    }
       else        {
           document.getElementById('address_invoice').style.visibility ="";   
        }
    }
   window.onload = onBillLoad;