function share_to_twitter(requestURL){

  var username = $("twitter_username").value;
  var password = $("twitter_password").value;
  var requestURL = requestURL + '&username=' + username + '&password=' + password;
  
  new Ajax.Request(requestURL, {
    onSuccess: function(transport) {
        if (transport.responseText.match(/Oups!: 401/)){
          $('twitter_response').innerHTML = "Mauvais nom d'utilisateur ou mot de passe.";
          $("twitter_password").value = "";
          $("twitter_password").focus();
        }else{
          $('twitter').innerHTML = "Article partagé";
        }
    }
  });
    
  }