function choices()
{
//elegir el numero de banner que se desean insertar, ej: 6
this[0] = 1;
//Tradedoubler Rota 728x90
this[1] = '<script type="text/javascript" src="http://impes.tradedoubler.com/imp?type(js)pool(377444)a(287784)" charset="ISO-8859-1"></script>';
//Netfilia 728x90 Rota
this[2] = '<script type="text/javascript"  src="http://www.netfilia.com/contenidos/insert_html.html?cmf=28873&con_capa=1&contenido=728x90&web=1317&p=2018684659&id=hie3VBhz75ewk"></script>';
//Tradedoubler Rota 728x90
this[3] = '<iframe allowtransparency="true" src="http://www.codigobarras.com/share-ht/jedis/ad_tpl.php?ic=2471&amp;r=7138" width="728" height="90" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" align="middle"></iframe>';
//si se pone arriba ej: 7 aqui aņadir this[7]=' codigo ';
}
function popUpBanner(list)
{
var today = new Date();
var choiceInstance = new choices();
var Banner = choiceInstance[(today.getSeconds() % choiceInstance[0]) + 1];
}
function grabBanner()
{
var today = new Date();
var choiceInstance = new choices();
var Banner = choiceInstance[(today.getSeconds() % choiceInstance[0]) + 1];
return Banner;
}
document.writeln(grabBanner());