function mostrar(id, change) {
  //if(id!='laciudad')ocultar('laciudad');
  //if(id!='lamunicipalidad')ocultar('lamunicipalidad');
  identity=document.getElementById(id);
  identity.className="visible";
  if(change){
    identity.className = identity.className + " menu3";
  }
}

function ocultar(id, change){
  identity=document.getElementById(id);
  identity.className="oculto";
  if(change){
    identity.className = identity.className + " menu3";
  }
}