function arrow() {
  if(parseInt(navigator.appVersion) < 4) return;
  if(document.layers) {
    document.all = document.layers;
//  document.layers.fleche.left = window.innerWidth - 34;
    document.layers.fleche.left = 0;
    document.layers.fleche.visibility = "visible";
  } else {
//    document.all.fleche.style.pixelLeft = document.body.clientWidth - 18;
    document.all.fleche.style.pixelLeft = 0;
    document.all.fleche.style.visibility = "visible";
  }
  var d = new Drift(); d.interval = 50;
  d.startDrift(document.all.fleche);
}