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.display == "inline"){ 
  		capa.display = (document.layers) ? "none" : "none";
  		}
  else {
  		capa.display = (document.layers) ? "inline" : "inline";
		}
  }