document.getElementById("subnavi").style.visibility = "hidden";
document.getElementById("subnavi2").style.visibility = "hidden";
//document.getElementById("subnavi3").style.visibility = "hidden";

function showLayer (id) {
  document.getElementById(id).style.visibility = "visible";
}
function hideLayer (id) {
  setTimeout("hide('subnavi')",3000);
}
function hide(id) {
  document.getElementById(id).style.visibility = "hidden";
}