function init() {  
  var node = 'listen_now';
  refresh_text(node);
  var interval = setInterval( function () { refresh_text(node) }, 10000);
  
  function request_text() {
    var xhr; 
    
    if (window.XMLHttpRequest) // Firefox 
      xhr = new XMLHttpRequest(); 
    else if (window.ActiveXObject) // Internet Explorer 
      xhr = new ActiveXObject('Microsoft.XMLHTTP'); 
    else { // XMLHttpRequest non supporté par le navigateur 
      alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
      return false;
    } 

    xhr.open('GET', 'annoncemusic.php', false); 
    xhr.send(null); 
    if (xhr.readyState == 4) {
      return xhr.responseText;
    }
  }
  
  function refresh_text(node) {
    var text = request_text();
    if (text) {
      document.getElementById(node).innerHTML = text;
    } else {
      var error = "Une erreur est survenue pendant le chargement du morceaux";
      document.getElementById(node).innerHTML = error;
    }
  }
}

window.onload = init;