function ocultaMenu()
{
	document.getElementById("menu2").style.display = "none";
	document.getElementById("menu3").style.display = "none";
}

function despliega(opc)
{
	ocultaMenu();
  var menu = document.getElementById("menu"+opc);
    if(menu.style.display == "none"){
      menu.style.display = "block";
    }
    else{
      menu.style.display = "none";
    }
}