function updatePaymentVisibility()
{
    $("creditCardInfo").style.display   = ($("radPaymentCreditCard").checked ? "" : "none");
    $("bankTransferInfo").style.display = ($("radPaymentBankTransfer").checked ? "" : "none");
}

function showOrderForm()
{
    $("orderForm").style.display = "block";
}

function increment(id, unitPrice)
{
    //convert to integer
    $("txtCart_" + id + "_Quantity").value++;
    updatePrice(id, unitPrice);
}

function decrement(id, unitPrice)
{
    if ($("txtCart_" + id + "_Quantity").value > 0) {
        if ($("txtCart_" + id + "_Quantity").value == 1) {
            if (!confirm("Viltu fjarlægja þessa vöru úr körfunni þinni?")) {
                return;
            }
        }
        $("txtCart_" + id + "_Quantity").value--;
        updatePrice(id, unitPrice);
    }
}

function updatePrice(id, unitPrice)
{
    var oldTotalPrice = $("txtCart_" + id + "_TotalPrice").innerHTML - 0;
    unitPrice = unitPrice - 0;
    var newQuantity = $("txtCart_" + id + "_Quantity").value - 0;
    $("txtCart_" + id + "_TotalPrice").innerHTML = newQuantity * unitPrice;
    $("txtCart_TotalCartPrice").innerHTML = ($("txtCart_TotalCartPrice").innerHTML - 0) - oldTotalPrice + newQuantity * unitPrice;
    if (newQuantity == 0) {
        updatePriceCallback.rowId = id;
    }
    ApOnAjax.updateQuantityOnCart(id, newQuantity, updatePriceCallback);
}

function updatePriceCallback(result) {
    $("prductRow_" + updatePriceCallback.rowId).style.display = "none";
}