// Varias utilidades usadas en este site.
// 
var capa
function cambio(idCapa)
{
	if (document.layers) capa = eval("document." + idCapa);
	if (document.all) capa = eval(idCapa + ".style");
	if (document.getElementById) capa = eval('document.getElementById("' + idCapa + '").style');
	if ((capa.visibility == "hidden") || (capa.visibility == "hide"))
	{
		capa.visibility = (document.layers) ? "show" : "visible" ;
	}
	else
	{
		capa.visibility = (document.layers) ? "hide" : "hidden" ;
	}
}

function desaparecer()
{
	var obj = document.getElementById("lopd");
	obj.style.display = "none";
}

function aparecer()
{
	var obj = document.getElementById("lopd");
	obj.style.display = "block";
}