function dateChanged(calendar) {
    if (calendar.dateClicked) {
      var y = (calendar.date.getFullYear() + "").substr(2,2);
      var m = calendar.date.getMonth()+1;     // integer, 0..11
      var d = calendar.date.getDate();      // integer, 1..31
      var mm = ""+m;
      var dd = "" + d;
      if(m < 10) mm="0"+m;
      if(d <10) dd = "0"+d;
      // redirect...
      var today = new Date();
      var yesterday = new Date();
      yesterday.setDate(yesterday.getDate()-1)
      var date2 = new Date(2007, 7, 15);
      if(calendar.date >= yesterday){
           window.location = "/";
      }else if(calendar.date < date2){
           window.location = "http://news.chinesejames.com/study/nodata.html";
      }else{
           window.location = "http://news.chinesejames.com/study/" + y + "/" + mm + "/" + dd + "0index.html";
      }
    }
  };

  Calendar.setup(
    {
      flat         : "calendar-container", // ID of the parent element
      flatCallback : dateChanged           // our callback function
    }
  );