// JavaScript Document

function activa_submenu1() {  
  var a=document.getElementById("submenu2");
  a.style.visibility="hidden";
  a=document.getElementById("submenu1");
  a.style.visibility="visible";
}
function activa_submenu2() {  
  var a=document.getElementById("submenu1");
  a.style.visibility="hidden";
  a=document.getElementById("submenu2");
  a.style.visibility="visible";
}
function desactiva_submenus() {
  var a=document.getElementById("submenu1");
  a.style.visibility="hidden";
  a=document.getElementById("submenu2");
  a.style.visibility="hidden";
}