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

    if (document.commentform.IsDeliverySame.checked) {

        document.commentform.DeliveryFirstnames.value = document.commentform.BillingFirstnames.value;
        document.commentform.DeliveryFirstnames.className = "inputBoxDisable";
        document.commentform.DeliveryFirstnames.readOnly = true;
        
        document.commentform.DeliverySurname.value = document.commentform.BillingSurname.value;
        document.commentform.DeliverySurname.className = "inputBoxDisable";
        document.commentform.DeliverySurname.readOnly = true;
        
        document.commentform.DeliveryAddress1.value = document.commentform.BillingAddress1.value;
        document.commentform.DeliveryAddress1.className = "inputBoxDisable";
        document.commentform.DeliveryAddress1.readOnly = true;

        document.commentform.DeliveryAddress2.value = document.commentform.BillingAddress2.value;
        document.commentform.DeliveryAddress2.className = "inputBoxDisable";
        document.commentform.DeliveryAddress2.readOnly = true; 

        document.commentform.DeliveryCity.value = document.commentform.BillingCity.value;
        document.commentform.DeliveryCity.className = "inputBoxDisable";
        document.commentform.DeliveryCity.readOnly = true;

        document.commentform.DeliveryPostCode.value = document.commentform.BillingPostCode.value;
        document.commentform.DeliveryPostCode.className = "inputBoxDisable";
        document.commentform.DeliveryPostCode.readOnly = true;

        document.commentform.DeliveryCountry.value = document.commentform.BillingCountry.value;
        document.commentform.DeliveryCountry.className = "inputBoxDisable";
        document.commentform.DeliveryCountry.readOnly = true;

        document.commentform.DeliveryState.value = document.commentform.BillingState.value;
        document.commentform.DeliveryState.className = "inputBoxDisable";
        document.commentform.DeliveryState.readOnly = true;

        document.commentform.DeliveryPhone.value = document.commentform.BillingPhone.value;
        document.commentform.DeliveryPhone.className = "inputBoxDisable";
        document.commentform.DeliveryPhone.readOnly = true;
    } 
    else 
    {
        document.commentform.DeliveryFirstnames.readOnly = false;
        document.commentform.DeliveryFirstnames.value = "";
        document.commentform.DeliveryFirstnames.className = "inputBoxEnable";
        document.commentform.DeliveryFirstnames.focus();
        document.commentform.DeliverySurname.readOnly = false;
        document.commentform.DeliverySurname.value = "";
        document.commentform.DeliverySurname.className = "inputBoxEnable";
        document.commentform.DeliveryAddress1.readOnly = false;
        document.commentform.DeliveryAddress1.value = "";
        document.commentform.DeliveryAddress1.className = "inputBoxEnable";
        document.commentform.DeliveryAddress2.readOnly = false;
        document.commentform.DeliveryAddress2.value = "";
        document.commentform.DeliveryAddress2.className = "inputBoxEnable";
        document.commentform.DeliveryCity.readOnly = false;
        document.commentform.DeliveryCity.value = "";
        document.commentform.DeliveryCity.className = "inputBoxEnable";
        document.commentform.DeliveryPostCode.readOnly = false;
        document.commentform.DeliveryPostCode.value = "";
        document.commentform.DeliveryPostCode.className = "inputBoxEnable";
        document.commentform.DeliveryCountry.readOnly = false;
        document.commentform.DeliveryCountry.value = "";
        document.commentform.DeliveryCountry.className = "inputBoxEnable";
        document.commentform.DeliveryState.readOnly = false;
        document.commentform.DeliveryState.value = "";
        document.commentform.DeliveryState.className = "inputBoxEnable";
        document.commentform.DeliveryPhone.readOnly = false;
        document.commentform.DeliveryPhone.value = "";
        document.commentform.DeliveryPhone.className = "inputBoxEnable";
    }
}