var m_nIndex=0;
var m_aIds=new Array();

 var nPageId = ReadQueryString("pgid");
 
 if (nPageId.length > 0)
    load_video_list();

function add_Id(piId)
{
 m_aIds[m_nIndex]=piId;
 ++m_nIndex;
}

function load_video_list ()
{
 add_Id("poem_plum_flower.htm");
 add_Id("poem_he_zhizhang-willow.htm");
 add_Id("poem_li_bai-jing_yesi.htm");
 add_Id("poem_wang_wei-one_hearted.htm");
 add_Id("poem_wang_zhihuan-at-heron-lodge.htm");
 add_Id("poem_du_qiuniang-the_gold_threaded_robe.htm");
 add_Id("poem_he_zhizhang-coming_home.htm");
 add_Id("poem_li_bai-through_the_yangzi_gorges.htm");
 add_Id("poem_meng_haoran-mooring_on_river.htm");
 add_Id("poem_wang_wei-lines.htm");
 add_Id("poem_wang-changling-in_her_quiet_window.htm");
 add_Id("poem_yuan_zhen-summer_palace.htm");
 add_Id("poem_meng_haoran-spring_morning.htm");
 add_Id("poem_zhang_ji-fengqiao_yebo.htm");
 add_Id("poem_meng_jiao-traveller_song.htm");
 add_Id("poem_du_fu-spring_view.htm");
 add_Id("poem_jia_dao-a_note_left_for_an_absent_ecluse.htm");
  
 BtSetCookie ("pageIds", m_aIds.join("|"));
}


function getNextVideo ()
{
 var sUrl = "";
 var nPageId = ReadQueryString("pgid");
 
 if (nPageId.length > 0)
 {
  ++nPageId;
  if (nPageId > m_nIndex)
      nPageId = 1;

  sUrl = m_aIds[nPageId - 1];
  sUrl += "?pgid=" + nPageId 
 }
 
 return sUrl;
}