JavaScript: Google Maps JavaScript API V3: How to make InfoWindow to each markers

google-maps-javascript-api-v3-infowindow.js

var infoWindow = new google.maps.InfoWindow();

var marker = (function(data) {
    var latLng = new google.maps.LatLng(data.latitude, data.longitude);
    var marker = new google.maps.Marker({
        position: latLng,
        icon: markerImage
    });

    google.maps.event.addListener(marker, 'click', function(){
        infoWindow.setOptions({
            position: latLng,
            content: getWindowHtml(data)
        });
        infoWindow.open(map, marker);
    });

    return marker;
})(data);