gistfile1.js

  <script type="text/javascript">
      $(document).ready(function() {
        var dropdownW = $('ul.dropdown').prev('a.dropdown').innerWidth();
        $('ul.dropdown').width(dropdownW);

        $('a.dropdown').bind('click touchend', function(e) {
          var dropdown = $(this).next('ul.dropdown')
          if (!dropdown.is(':visible'))
          {
            dropdown.show();
            
            var onClickDocument = function(e) {
              var ul = $(e.target).closest('ul.dropdown')
              if ( ul.length < 0 || ul.get(0) != dropdown.get(0) )
              {
                $('ul.dropdown').hide();
                $(document).unbind('click touchend', onClickDocument);
              }
            };

            $(document).bind('click touchend', onClickDocument);

            return false;
          }
          else
            {
              return true;
            }
        })
      })
    </script>