iiirc/iiirc

div#search
  div.search-content
    javascript:
      (function() {
        var cx = '#{j cx}';
        var gcse = document.createElement('script');
        gcse.type = 'text/javascript';
        gcse.async = true;
        gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
            '//www.google.com/cse/cse.js?cx=' + cx;
        var s = document.getElementsByTagName('script')[0];
        s.parentNode.insertBefore(gcse, s);
      })();
    erb:
      <gcse:search></gcse:search>