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) {
            if ( $('ul.dropdown').is(':visible') && !$(e.target).parents('ul.dropdown').length > 0 )
            {
              $('ul.dropdown').hide();
              $(document).unbind('click touchend', onClickDocument);
              e.preventDefault();
            }
          };

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

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