function init() {
  if(parseInt(navigator.appVersion) < 4) return;
  if(document.layers) {
    document.all = document.layers;
    document.layers.menutop.right = window.innerWidth - 34;
    document.layers.menutop.visibility = "visible";
  } else {
    document.all.menutop.style.pixelRight = document.body.clientWidth - 20;
    document.all.menutop.style.visibility = "visible";
  }
  var d = new Drift(); d.interval = 50;
  d.startDrift(document.all.menutop);
}