function AddPackage(product_id)
{

	var url=null;
	if(product_id==null || product_id<1)
		url="http://shopping.dangdang.com/shoppingcart/shopping_cart.aspx";
	else
		url="http://shopping.dangdang.com/shoppingcart/shopping_cart_add.aspx?product_ids="+product_id+"&reference_url="+escape(window.location.href);

	var popup=window.open(url,"shoppingcart");
	popup.focus()
}