//加入购物车，商品id为空或者小于1的时候跳转到购物车页面
function AddToShoppingCart(product_id)
{
  var url=null;
  if(product_id==null || product_id<1)
    url="http://shoppingb.dangdang.com/shoppingcart/shopping_cart.aspx";
  else
    url="http://shoppingb.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()
}
//加入收藏
function AddToFavorlist(product_id)
{  
  var url="http://customerb.dangdang.com/wishlist/cust_wish_add.aspx?productid="+product_id;
  var popup=window.open(url,"favorlist");
  popup.focus()
}