function fc_init()
{
  var interval = window.setInterval(fn_titre,500);
  var s_msg = document.getElementById('info_manif').value;      
  var i_taille = s_msg.length;
  
  function fn_titre()
  {
    document.getElementById('info_manif').value = s_msg;
    s_msg = s_msg.slice(1,i_taille) + s_msg.charAt(0);
  }
}

add_event(window,"load",fc_init);