function onResponse(tweets) {
	
	var i = 0;
	var output = '';
	
	for (var i in tweets) {
		output += ('<p>' + replaceTwitterNameWithHTMLLinks(replaceURLWithHTMLLinks(tweets[i].text)) + '<br /><span>' + relative_time(tweets[i].created_at) + '</span></p>');
	}
	
	document.getElementById('twitterFeed').innerHTML = output;
}

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 'less than a minute ago';
  } else if(delta < 120) {
    return 'about a minute ago';
  } else if(delta < (60*60)) {
    return (parseInt(delta / 60)).toString() + ' minutes ago';
  } else if(delta < (120*60)) {
    return 'about an hour ago';
  } else if(delta < (24*60*60)) {
    return 'about ' + (parseInt(delta / 3600)).toString() + ' hours ago';
  } else if(delta < (48*60*60)) {
    return '1 day ago';
  } else {
    return (parseInt(delta / 86400)).toString() + ' days ago';
  }
}

function replaceURLWithHTMLLinks(text) {
  var exp = /(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
  return text.replace(exp,"<a href='$1'>$1</a>"); 
}

function replaceTwitterNameWithHTMLLinks(text) {
  var exp = /(@[A-Z0-9]+)/ig;
  return text.replace(exp,"<a href='http://twitter.com/$1'>$1</a>"); 
}