function choices()
{
//elegir el numero de banner que se desean insertar, ej: 6
this[0] = 1;
this[1] = '<script type="text/javascript">google_ad_client = "pub-4029711548653795"; google_ad_slot = "2167686283"; google_ad_width = 468; google_ad_height = 60; </script><script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>';
//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());