anchor.diff:        },{
           "featureType": "poi.school",
           "stylers": [
  -          { "visibility": "off" }
  +          { "visibility": "on" }
           ]
         },{
           "featureType": "landscape.man_made",
  
positive.code:         cityBoundaries = map.data.addGeoJson(data);
  
          $.each(cityBoundaries, function (index, feature) {
            map.data.overrideStyle(feature, {strokeWeight: 4});
          });
  
          if ($('#home_schools_tab').length > 0) {
            google.maps.event.addDomListener(document.getElementById('home_schools_tab'), 'click', function () {
              $.each(cityBoundaries, function (index, feature) {
                map.data.add(feature);
                map.data.overrideStyle(feature, {strokeWeight: 4});
              });
            });
          }
  
negative.code:             google.maps.event.addDomListener(document.getElementById('zone_schools_tab'), 'click', function () {
                $.each(cityBoundaries, function (index, feature) {
                  map.data.add(feature);
                  map.data.overrideStyle(feature, {strokeWeight: 3});
                });
              });
            }
  