function buildUrl(url, parameters){
      var qs = [];
      for(var key in parameters) {
        var value = parameters[key];
        qs.push(encodeURIComponent(key) + "=" + encodeURIComponent(value));
      }
      url = url + "?" + qs.join('&');
      return url;
    }

    function generateBRBMarkup(site) {
      params.source = 'brb';
      generateBeaconMarkup(params);
      var englishHeader = 'Will be right back...';
      var englishMessage1 = 'Thank you for your patience.';
      var englishMessage2 = 'Our engineers are working quickly to resolve the issue.';
      var defaultLogoStyle = '';
      var siteDataMap = {
        'default': {
          logo: 'https://s.yimg.com/rz/p/yahoo_frontpage_en-US_s_f_p_205x58_frontpage.png',
          logoAlt: 'Yahoo Logo',
          logoStyle: defaultLogoStyle,
          header: englishHeader,
          message1: englishMessage1,
          message2: englishMessage2
        }
      };

      var siteDetails = siteDataMap['default'];

      document.write('<table><tbody><tr><td>');
      document.write('<div id="content">');
      document.write('<img src="' + siteDetails['logo'] + '" alt="' + siteDetails['logoAlt'] + '" style="' + siteDetails['logoStyle'] + '">');
      document.write('<h1 style="margin-top:20px;">' + siteDetails['header'] + '</h1>');
      document.write('<p id="message-1">' + siteDetails['message1'] + '</p>');
      document.write('<p id="message-2">' + siteDetails['message2'] + '</p>');
      document.write('</div>');
      document.write('</td></tr></tbody></table>');
    }

    function generateBeaconMarkup(params) {
        document.write('<img src="' + buildUrl('//geo.yahoo.com/b', params) + '" style="display:none;" width="0px" height="0px"/>');
        var beacon = new Image();
        beacon.src = buildUrl('//bcn.fp.yahoo.com/p', params);
    }

    var hostname = window.location.hostname;
    var device = 'desktop';
    var ynet = ('-' === '1');
    var time = new Date().getTime();
    var params = {
        s: '1197757129',
        t: time,
        err_url: document.URL,
        err: '404',
        test: '-',
        ats_host: 'e7.ycpi.deb.yahoo.com',
        rid: '-',
        message: 'Not Found on Accelerator'
    };

    if(ynet) {
        document.write('<div style="height: 5px; background-color: red;"></div>');
    }
    generateBRBMarkup(hostname, params);