Adding a marker to Google maps

[Tyssen]

How do you add a marker to a Google map? I know it has something to do with map.addOverlay(marker), but what value should marker be? Here's what I've got so far:

    <script type="text/javascript">
        function load() {
            if (GBrowserIsCompatible()) {
                  var map = new GMap2(document.getElementById ("map"));  
                  map.addControl(new GSmallMapControl());
                  map.setCenter(new GLatLng(-27.462719, 153.029122), 16);
            }
          }
    </script>

[Dan Grossman]

var point1 = new GMarker(new GLatLng(38, -97));
map.addOverlay(point1);

var point2 = new GMarker(new GLatLng(40, -95));
map.addOverlay(point2);

[Tyssen]

I actually just got it working this way:

    var geocoder;
    var map;
    var address = "Brisbane, QLD 4000, Australia";
    function load() {
        map = new GMap2(document.getElementById("map"));
        map.addControl(new GSmallMapControl());
        geocoder = new GClientGeocoder();
        geocoder.getLocations(address, addToMap);
    }
 
    function addToMap(response) {
        place = response.Placemark[0];
        point = new GLatLng(place.Point.coordinates[1],
        place.Point.coordinates[0]);
        map.setCenter(point, 16);
        marker = new GMarker(point);
        map.addOverlay(marker);
    }