var how_many_ads = 2;
var now = new Date();
var sec = now.getSeconds();
var ad = sec % how_many_ads;
ad +=1;

if (ad==1)
{
//728x90 35k Megabanner Opinion
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/3/13e1/71c233b2d9293477?o=j&rnd=' + rnd + '&crs=' + cs + '"></scr' + 'ipt>');
}

if (ad==2)
{
//728x90 35k Megabanner Opinion - Poner algo default
	with (document) {
	write("<script type='text/javascript' src='http://www.eluniverso.com/data/recursos/banners/js/default_megabanner.js'>");
	write("<\/script>");
	}
}