// Función para mostrar el menu desplegable
var t;

function activar()
{
	clearTimeout(t);
}

function mostrar_techzone()
{
	var capa = document.getElementById('techzone');
    capa.style.visibility = "visible";
}

function mostrar_visitor()
{
	var capa = document.getElementById('visitor');
    capa.style.visibility = "visible";
}

function mostrar_mediainfo()
{
	var capa = document.getElementById('mediainfo');
    capa.style.visibility = "visible";
}


function mostrar_exhibitor()
{
	var capa = document.getElementById('exhibitor');
    capa.style.visibility = "visible";
}
function mostrar_livefeature()
{
	var capa = document.getElementById('livefeature');
    capa.style.visibility = "visible";
}

function ocultar_submenus()
{
	var capa1 = document.getElementById('techzone');
    capa1.style.visibility = "hidden";
	var capa2 = document.getElementById('exhibitor');
    capa2.style.visibility = "hidden";
	var capa3 = document.getElementById('livefeature');
    capa3.style.visibility = "hidden";
		var capa3 = document.getElementById('mediainfo');
    capa3.style.visibility = "hidden";
		var capa3 = document.getElementById('visitor');
    capa3.style.visibility = "hidden";

}
function retardo()
{
	t=setTimeout('ocultar_submenus()',100);
}