function handle_login() // espace authentification abonne
  {
    getXMLHTTP();

      xhr.onreadystatechange = function()
          {
              if( xhr.readyState == 4 )
                  {
                      if( xhr.status == 200 )
                          {
                            rep = xhr.responseText ;
                            {
                            //more code here///////////////////////////////////////////////////
                            }
                          }
                   }

              else
              {
                   document.getElementById("button").disabled= false;
                   document.getElementById("charge").style.visibility="hidden";

              }
          };
      username = document.getElementById('username').value;
      password = document.getElementById('password').value;
      xhr.open("GET", "cck_connect_hotline.php?login=" + username + "&pass=" + password, true);
      //xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      xhr.send(null);
  }