// run when checkbox is clicked to synchronise the delivery details with billing details
function IsDeliverySame_clicked() {

    if (document.customerform.IsDeliverySame.checked) {

        document.customerform.DeliveryFirstnames.value =  document.customerform.BillingFirstnames.value;
        document.customerform.DeliveryFirstnames.className = "inputBoxDisable";
        document.customerform.DeliveryFirstnames.disabled = true;
        
        document.customerform.DeliverySurname.value =  document.customerform.BillingSurname.value;
        document.customerform.DeliverySurname.className = "inputBoxDisable";
        document.customerform.DeliverySurname.disabled = true;
        
        document.customerform.DeliveryAddress1.value = document.customerform.BillingAddress1.value;
        document.customerform.DeliveryAddress1.className = "inputBoxDisable";
        document.customerform.DeliveryAddress1.disabled = true;

        document.customerform.DeliveryAddress2.value =  document.customerform.BillingAddress2.value;
        document.customerform.DeliveryAddress2.className = "inputBoxDisable";
        document.customerform.DeliveryAddress2.disabled = true; 

        document.customerform.DeliveryCity.value = document.customerform.BillingCity.value;
        document.customerform.DeliveryCity.className = "inputBoxDisable";
        document.customerform.DeliveryCity.disabled = true;

        document.customerform.DeliveryPostCode.value = document.customerform.BillingPostCode.value;
        document.customerform.DeliveryPostCode.className = "inputBoxDisable";
        document.customerform.DeliveryPostCode.disabled = true;


    } 
    else 
    {
        document.customerform.DeliveryFirstnames.disabled = false;
        document.customerform.DeliveryFirstnames.className = "inputBoxEnable";
        document.customerform.DeliveryFirstnames.focus();
        document.customerform.DeliverySurname.disabled = false;
        document.customerform.DeliverySurname.className = "inputBoxEnable";
        document.customerform.DeliveryAddress1.disabled = false;
        document.customerform.DeliveryAddress1.className = "inputBoxEnable";
        document.customerform.DeliveryAddress2.disabled = false;
        document.customerform.DeliveryAddress2.className = "inputBoxEnable";
        document.customerform.DeliveryCity.disabled = false;
        document.customerform.DeliveryCity.className = "inputBoxEnable";
        document.customerform.DeliveryPostCode.disabled = false;
        document.customerform.DeliveryPostCode.className = "inputBoxEnable";
;
    }
}