function Hide(menu) {
  menuitem = eval("document.getElementById(menu)");
  menuitem.style.display = "none";
}

function Show(menu) {
  menuitem = eval("document.getElementById(menu)");
  menuitem.style.display = "block";

  if(menu == "menu5") {
    document.all.menu5.style.background = "#0000FF";
  }
}