function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
var ultimo=null;
function mostrarMenu(menu){
if(ultimo==menu){ultimo=null;}
	if(menu!=null){
		var actual=document.getElementById(menu);
		actual.style.visibility="visible";
	}
	if(ultimo!=null){
		var anterior=document.getElementById(ultimo);
		anterior.style.visibility="hidden";
	}
ultimo=menu;
}

function ocultarMenu(){
	
	if(ultimo!=null){
		var anterior=document.getElementById(ultimo);
		anterior.style.visibility="hidden";
	}
ultimo=null;
}
function mostrar(nombreCapa){
	document.getElementById(nombreCapa).style.visibility="visible";
}
function ocultar(nombreCapa){
	document.getElementById(nombreCapa).style.visibility="hidden";
}