<script>
      (function () {
          var cx = 'abc';
          var gcse = document.createElement('script');
          gcse.type = 'text/javascript';
          gcse.async = true;
          gcse.src = 'https://cse.google.com/cse.js?cx=' + cx;
          var s = document.getElementsByTagName('script')[0];
          s.parentNode.insertBefore(gcse, s);
      })();
</script>

<p>
gcse:searchbox-only   webSearchQueryAddition="mumbai" resultsUrl="http://www.hunt.in/searchresult.html"  gcse:searchbox-only
</p>

gcse:search webSearchQueryAddition="mumbai" gcse:search