function load() {
  if (GBrowserIsCompatible()) {
    var map = new GMap2(document.getElementById("map"));
    var point = new GLatLng(-43.45920215, 172.43428261);
    map.setCenter(point, 11);
    map.addControl(new GLargeMapControl());
    
    var pushPin = new GIcon(G_DEFAULT_ICON);
    pushPin.image = "http://maps.google.com/mapfiles/ms/icons/blue-pushpin.png";
    pushPin.printImage = pushPin.image;
    pushPin.iconSize = new GSize(32, 32);
    pushPin.iconAnchor = new GPoint(10, 40);
    
    markerOptions = { icon:pushPin };
    
    map.addOverlay(new GMarker(point, markerOptions));
  }
}

window.onload = function() {  
  if (document.getElementById('map')) { load(); } 
};

window.onunload = function() { if (document.getElementById('map')) { GUnload(); } };