(function(opt) {
  var d = document;
  if (d.getElementById(opt.img_id)) return;
  function toJSON(hash) {
    var datas = [];
    for (var i in hash) {
      switch (typeof hash[i]) {
      case 'string':
        datas[datas.length] = '"' + i.replace(/"/g, '\\"') + '"' + ':"' + hash[i].replace(/"/g, '\\"') + '"';
        break;
      case 'number':
        datas[datas.length] = '"' + i.replace(/"/g, '\\"') + '"' + ":" + hash[i];
        break;
      }
    }
    return '{' + datas.join(',') + '}';
  }
  var links = d.getElementsByTagName('link'), type_re = new RegExp('xml', 'i'), feed = 'http://dr-shift.shooti.jp/', uid = opt.uid_prefix;
  for (var i = 0, len = links.length; i < len; i++) {
    var rel = links[i].getAttribute("rel"), type = links[i].getAttribute('type');
  }
  for (var i = 0; i < opt.uid_randlen; i++) uid += opt.uid_randbase[~~(Math.random() * opt.uid_randbase.length)];
  var titles = d.getElementsByTagName('title');
  var send_data = {
    i: uid,
    n: titles.length ? titles[0].innerHTML : d.title,
    u: location.href,
    r: document.referrer,
    f: feed,
    t: 0
  };
  d.write('<img src="' + opt.ping_before + encodeURIComponent(toJSON(send_data)) + opt.ping_after + '" style="display:none" alt="" id="' + opt.img_id + '" />');
  var staytimes_cnt = 0;
  for (var i = 0, len = opt.staytimes.length; i < len; i++) {
    setTimeout(function() {
      send_data.t = opt.staytimes[staytimes_cnt];
      d.getElementById(opt.img_id).src = opt.ping_before + encodeURIComponent(toJSON(send_data)) + opt.ping_after;
      staytimes_cnt++;
    }, opt.staytimes[i] * 1000);
  }
})({
  img_id:       '__thatping_tracking',
  uid_prefix:   'drs_',
  uid_randbase: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'.split(''),
  uid_randlen:  12,
  staytimes:    [5, 10, 30, 60],
  ping_before:  'http://d.thatsping.jp/?',
  ping_after:   '' 
});