Google Maps InfoWindow for Markers Vs Polygon Drawings

Marker :

var myLatlng = new google.maps.LatLng(-25.363882,131.044922);
  var mapOptions = {
    zoom: 4,
    center: myLatlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }

 

var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

var contentString = 'Marker InfoWindow in Google Map';

 

var infowindow = new google.maps.InfoWindow({
      content: contentString
  });

  var marker = new google.maps.Marker({
      position: myLatlng,
      map: map,
      title: 'Uluru (Ayers Rock)'
  });
  google.maps.event.addListener(marker, 'click', function() {
    infowindow.open(map,marker); // This is the Important point
  });

 

Polygon Drawing:

statePolygon.wPet = "Polygon InfoWindow in Google Map";
statePolygon.infoWindow = new google.maps.InfoWindow();

google.maps.event.addListener(statePolygon,"mouseover",function(event){
    this.setOptions({fillColor: "#00FF00"});
    this.infoWindow.setContent(this.wPet);
    this.infoWindow.open(map);  // This is the Important point

    this.infoWindow.setPosition(event.latLng);
});