<!-- Begin AdvertPRO 3.6 Pop Under Code -->
<!-- Region ID#: 120 -->
<!-- Region Name: NACIONALES POP UP -->
<!-- Display Once: Enabled -->

var enableThisPopUnder = false;

if (enableThisPopUnder) {
   if (GNGetThisCookie('popunder120')=='') {
      var popUnderWindow = window.open("http://www.nacionadserver.com/cgi-bin/advertpro/banners.pl?region=120&mode=POPUP&keyword=NULL", "popunder", "width=250,height=250");

      document.cookie="popunder120=yes;path=/";
      try {
         popUnderWindow.blur();
      } catch (errorObject) {}
   }
}

function GNGetThisCookie(name) {
  var search = name + "=";
  var returnvalue = "";
  if (document.cookie.length > 0) {
    offset = document.cookie.indexOf(search);
    if (offset != -1) {
      offset += search.length;
      end = document.cookie.indexOf(";", offset);
      if (end == -1) {
        end = document.cookie.length;
      }
      returnvalue=unescape(document.cookie.substring(offset, end));
    }
  }
  return returnvalue;
}
<!-- End AdvertPRO 3.6 Pop Up Code -->