function twitterCallback(obj) {
	var statusHTML = "<span class=\"timestamp\">Could not get twitter message.</span>";
	var twJSON = obj;

	if (twJSON != "") {
		statusHTML = '<span class=\"tw-msg\">' + twJSON[0].text + '</span><span class=\"tw-time\">... ' + relative_time(twJSON[0].created_at) + '</span>';
	}
	document.getElementById('twitter_status').innerHTML = statusHTML;
}

function relative_time(time_value) {
  var values = time_value.split(" ");
  time_value = values[1] + " " + values[2] + ", " + values[5] + " " + values[3];
  var parsed_date = Date.parse(time_value);
  var relative_to = (arguments.length > 1) ? arguments[1] : new Date();
  var delta = parseInt((relative_to.getTime() - parsed_date) / 1000);
  delta = delta + (relative_to.getTimezoneOffset() * 60);

  if (delta < 60) {
    return '1分以内';
  } else if(delta < 120) {
    return '約1分前';
  } else if(delta < (60*60)) {
    return (parseInt(delta / 60)).toString() + '分前';
  } else if(delta < (120*60)) {
    return '約1時間前';
  } else if(delta < (24*60*60)) {
    return '約' + (parseInt(delta / 3600)).toString() + '時間前';
  } else if(delta < (48*60*60)) {
    return '1日前';
  } else {
    return (parseInt(delta / 86400)).toString() + '日前';
  }
}

document.write('<script type="text/javascript" src="http://twitter.com/statuses/user_timeline/daisuke_kakura.json?callback=twitterCallback&count=1"></script>');