function __setCookie(name, value, expires, path, domain, secure) {
  var curCookie = name + "=" + escape(value) +
      ((expires) ? "; expires=" + expires : "") +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      ((secure) ? "; secure" : "");
  document.cookie = curCookie;
}
function __getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}

function pixel(referer)
{
  var regex = /\//g;
  var ref = escape(referer,1).replace(regex,'%2F');
  if(__getCookie('elpais_ctrl')==null)
  {
        var d = new Date();
        __setCookie('elpais_ctrl',d.getTime()+navigator.platform+navigator.appCodeName+screen.width,'Thu, 31 Dec 2008 23:59:59 UTC','/','');
  }

  var img_pcom = new Image();
  img_pcom.src = 'http://control.prisacom.com/ojd/elpais/pixel.php?sec=cob/revelalo&domain=elpais&user='+__getCookie('elpais_ctrl')+'&r='+ref+'&random='+Math.floor(Math.random()*100000);

}
pixel(document.location.href);