// JavaScript Document
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" ;
	}
}