anchor.diff:          activeInfoWindow = infoWindow;
         });
       });
  +    hydrantIds.push(hydrantId);
     }
     $('#location_form').submit(function() {
       if($('#address').val() === '') {
  
positive.code:       new google.maps.Point(13.0, 18.0)
      );
      var marker = new google.maps.Marker({
        position: point,
        map: map,
        icon: image,
        shadow: shadow
      });
      google.maps.event.addListener(marker, 'click', function() {
  
negative.code:   var activeHydrantId;
    var activeMarker;
    var activeInfoWindow;
    var hydrantIds = [];
    function addMarker(hydrantId, point, color) {
      if($.inArray(hydrantId, hydrantIds) != -1) {
        return;
      }
      var image = new google.maps.MarkerImage(color,
        new google.maps.Size(27.0, 37.0),
        new google.maps.Point(0, 0),
  