function load() {
  if (GBrowserIsCompatible()) {
    var map = new GMap2(document.getElementById("map"));
    var point = new GLatLng(22.5, 113.5);
    var zhuhai = new GLatLng(22.2, 113.5);
    var dongguan = new GLatLng(23, 114);
    var macau = new GLatLng(22.1, 113.5);
    var kowloon = new GLatLng(22.33, 114.2);
    map.setCenter(point, 7);
    map.addControl(new GSmallMapControl());
    map.addControl(new GMapTypeControl());
    map.addOverlay(new GMarker(zhuhai));
    map.addOverlay(new GMarker(dongguan));
    map.addOverlay(new GMarker(macau));
    map.addOverlay(new GMarker(kowloon));
  }
}