<!--
function addtosubscription_cb( ret ){
  document.getElementById("subscriptioncount").innerHTML ++;
  document.getElementById("addtosubscription_" + isbn ).innerHTML = "已經在我的追蹤名單中";  
}

function addtosubscription( isbn ){
  document.getElementById("addtosubscription_" + isbn ).innerHTML = "加入追蹤名單中...";  
  x_ajax_addtosubscription( isbn, addtosubscription_cb );
}
-->