function get_hour_id(hour){
    if (hour>=9&&hour<12)
      hour_id = 1;
    else if (hour>=12&&hour<15)
      hour_id = 2;
    else if (hour>=15&&hour<18)
      hour_id = 3;
    else
      hour_id = 4;
    return hour_id;
  }
  function get_suffix(){
    var now = new Date();
    var str = now.getYear().toString() + now.getMonth().toString() + now.getDate().toString();
    return str + "_" + get_hour_id(now.getHours());
  }
  var js_src = "http://js.51hejia.com/adc/www_data.js?" + get_suffix();
  document.write("<script type='text/javascript' src='" + js_src + "'></script>");