function OcultaControles(objetoVisualizar) { 
elem = document.getElementById(objetoVisualizar)
if (elem.style.display=='none') {

elem.style.display='block';
} else {
elem.style.display='none';
}
}

function ventanaSecundaria (URL){ 
   window.open(URL,"ventana1","width=520,height=600,scrollbars=YES") 
}