window.onload = function () {
if (document.getElementById) {  // DOM3 = IE5, NS6
document.getElementById('menu').style.visibility = 'hidden';
}
else {
if (document.layers) {  // Netscape 4
document.menu.visibility = 'hidden';
}
else {  // IE 4
document.all.menu.style.visibility = 'hidden';
      }
   }

}