var nav = navigator
browserIE = ((nav.appName == "Microsoft Internet Explorer") && (parseInt(nav.appVersion) >= 4 ))
browserNS1 = ((nav.appName == "Netscape") && (parseInt(nav.appVersion) < 5 ) ) // Netscape < 4.7
browserNS2 = ((nav.appName == "Netscape") && (parseInt(nav.appVersion) >= 5 ) )// Netscape >= 6

// Precarga de imágenes ----------------------------------------
var i;
var imagenes = new Array("images/menu/cartaPresidente.gif","images/menu/cartaPresidenteBis.gif","images/menu/quienesSomos.gif","images/menu/quienesSomosBis.gif","images/menu/organigrama.gif","images/menu/organigramaBis.gif","images/menu/dondeEstamos.gif","images/menu/dondeEstamosBis.gif","images/menu/agenda.gif","images/menu/agendaBis.gif","images/menu/concejales.gif","images/menu/concejalesBis.gif","images/menu/balance.gif","images/menu/balanceBis.gif","images/menu/programas.gif","images/menu/programasBis.gif","images/menu/ppInforma.gif","images/menu/ppInformaBis.gif","images/menu/boletin.gif","images/menu/boletinBis.gif","images/menu/noticias.gif","images/menu/noticiasBis.gif","images/menu/nuestroPartido.gif","images/menu/nuestroPartidoBis.gif","images/menu/nuestroMunicipio.gif","images/menu/nuestroMunicipioBis.gif","images/menu/sugerencias.gif","images/menu/sugerenciasBis.gif","images/menu/NGPresentacion.gif","images/menu/NGPresentacionBis.gif","images/menu/NGQuienesSomos.gif","images/menu/NGQuienesSomosBis.gif","images/menu/NGDondeEstamos.gif","images/menu/NGDondeEstamosBis.gif","images/menu/NGOrganigrama.gif","images/menu/NGOrganigramaBis.gif","images/menu/NGActividades.gif","images/menu/NGActividadesBis.gif","images/menu/NGAfiliate.gif","images/menu/NGAfiliateBis.gif","images/menu/NGOpinion.gif","images/menu/NGOpinionBis.gif");
var lista_imagenes = new Array();
function cargarimagenes(){
for(i in imagenes){
lista_imagenes[i] = new Image();
lista_imagenes[i].src = imagenes[i];
}
}

function cambio(nombre,index){
    if ((browserIE)||(browserNS2))
	{
		document.images[nombre].src = lista_imagenes[parseInt(index)].src;

    }
    else if (browserNS1)
	{
		document.layers["upc3"].document.images[nombre].src = lista_imagenes[parseInt(index)].src;
    }
}