How do I get lat/long in a custom tiled google map?

I created a custom Google map with my own tiles, and I am trying to find the latitude and longitude of points to place markers. I am us开发者_StackOverflow中文版ing Google Maps API v3.

Following the "Event Context V3", I can get the lat/long of the centered position using this script:

google.maps.event.addListener(map, 'dragend', function() {
    var center = map.getCenter();
    alert(center.toString());
  });

How can I do this by just clicking on a part of the map, rather than dragging the map and changing the center?

Doesn't this work:

google.maps.event.addListener(map, 'click', function(event) {
            alert(event.latLng);
        });

?