var product_id, cart_button_id;
var item_already_added = false;


function change_product_image(image_src)
{
    document.getElementById("product_image").src = image_src;
}

function add_detail_item(_product_id, _cart_button_id)
{
    if (item_already_added)
    {
		view_cart();
		return;
    }

    product_id = _product_id;
    cart_button_id = _cart_button_id;

    // add the product to the cart
    shopping_cart_add_item(product_id, add_item_callback);
}


function item_added_ok()
{
    // change the button text and onClick function 
    var cart_button = document.getElementById(cart_button_id);
    cart_button.value = "view cart";

    item_already_added = true;
}


function view_cart()
{
    window.location = "../store/view_cart.php";
}