function choices()
{
//elegir el numero de banner que se desean insertar, ej: 6
this[0] = 1;
// PRIMER BANNER, Shopall 120x76
this[1] = '<iframe allowtransparency="true" src="http://www.codigobarras.com/share-ht/jedis/ad_tpl.php?ic=2471&amp;r=7161" width="120" height="76" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" align="middle"></iframe>';

//si se pone arriba ej: 6 aqui aņadir this[6]=' 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());