var how_many_ads = 10;
var now = new Date();
var sec = now.getSeconds();
var ad = sec % how_many_ads;
ad +=1;

if (ad==1 || ad==2 || ad==3)
{
//300x250 35k Banner Cuadrado Deportes
var rnd = (new String(Math.random())).substring(2,8) + (((new Date()).getTime()) & 262143);
var cs = document.charset || document.characterSet;
document.write('<scri' + 'pt language="JavaScript1.1" type="text/javascript" src="http://ads.us.e-planning.net/eb/3/13e1/8b72b990cc4de735?o=j&rnd=' + rnd + '&crs=' + cs + '"></scr' + 'ipt>');
}

if (ad==4 || ad==5 || ad==6 || ad==7 || ad==8 || ad==9 || ad==10)
{
//envio a imprimir el banner de google adsense
document.write("<script language=\"JavaScript\" src=\"\/data\/recursos\/banners\/js\/banner_google_cuadrado.js\"><\/script>");
}