var twitter_id = '_rentoni';
var twitter_count = 1;
var twitter_elem_id = 'twitter_data';

window.onload = function() {
  var url = 'http://twitter.com/statuses/user_timeline/' + twitter_id + '.json?callback=twitterCallback&count=' + twitter_count;
  var script = document.createElement('script');
  script.setAttribute('src', url);
  document.body.appendChild(script);
}
function twitterCallback(obj){
  var html = "";
  for(var i=0 ; i<twitter_count && i<obj.length; i++){
    html += "<a href='http://twitter.com/" + twitter_id + "/status/" + obj[i].id + "'>" + obj[i].text + "</a>";
  }
  document.getElementById(twitter_elem_id).innerHTML = html;
}