function mostrar(obj1,obj2) {
	if (obj1 != '')
		obtenerLayer(obj2).style.display = "none";
	if (obj2 != '')
		obtenerLayer(obj1).style.display = "inline";
}
function obtenerLayer(name) {
	var EsIE4 = (document.all) ? 1 : 0;
	var EsNS4 = (navigator.appName.indexOf("Netscape") >= 0 && parseFloat(navigator.appVersion) >= 4) ? 1 : 0;
	if (EsNS4)
		return buscarLayer(name, document);
	if (EsIE4)
		return eval('document.all.' + name);
	return null;
}

function buscarLayer(name,doc) {
	var i, layer;
	for (i = 0; i < doc.layers.length; i++) {
		layer = doc.layers[i];
		if (layer.name == name)
			return layer;
		if (layer.document.layers.length > 0)
			if ((layer = buscarLayer(name, layer.document)) != null)
				return layer;
	}
	return null;
}