function choices()
{
//elegir el numero de banner que se desean insertar, ej: 8
this[0] = 2;

// PRIMER BANNER, Tradedoubler 120x120 Rota

this[1] = '<script type="text/javascript" src="http://imp.tradedoubler.com/imp?type(js)pool(14936)a(287784)" charset="ISO-8859-1"></script>';

// SEGUNDO BANNER, Tradedoubler 120x120 Rota

this[3] = '<script type="text/javascript" src="http://imp.tradedoubler.com/imp?type(js)pool(14936)a(287784)" charset="ISO-8859-1"></script>';

// TERCER BANNER, Shopall General 120x106 Rota

this[2] = '<iframe allowtransparency="true" src="http://www.codigobarras.com/share-ht/jedis/ad_tpl.php?ic=2471&amp;r=7166" width="120" height="106" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" align="middle"></iframe>';
 
// CUARTO BANNER, Netfilia 120x60 Rota

this[4] = '<iframe name=afi120x60' + ' src="http://www.netfilia.com/contenidos/insert.html?cmf=1991&con_capa=1&contenido=120x60&web=1317&p=2124672102&id=hirYaXnD7lN92&url='+escape(location.href)+'"' + ' width=120 height=60 frameBorder=no border=0 marginWidth=0 marginHeight=0 scrolling=no style="border-style:none;" >' + '</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());