function init() {

      if (GBrowserIsCompatible()) {
        var map = new GMap2(document.getElementById("map"));
        var cLat = 22.278409381651418;
        var cLong = 114.16995942592621;
        var initZoom = 16;
        var location = new GLatLng(cLat, cLong);
        map.setCenter(location, initZoom);
		map.addControl(new GSmallMapControl());     
        var marker = new GMarker(location);
        map.addOverlay(marker);
      }

    else {
      alert("Sorry, the Google Maps API is not compatible with this browser");
    }
}
window.onload = init;  // run init function
window.onunload = GUnload; //unload