function oculta(){
	document.getElementById('submenu1').style.visibility = "hidden";
	document.getElementById('submenu2').style.visibility = "hidden";
}
function muestra1(){
	document.getElementById('submenu1').style.visibility = "visible";
	document.getElementById('submenu2').style.visibility = "hidden";
}
function muestra2(){
	document.getElementById('submenu1').style.visibility = "hidden";
	document.getElementById('submenu2').style.visibility = "visible";
}