var map;

function load() {
  if (GBrowserIsCompatible()) {
    map = new GMap2(document.getElementById("map"));
    map.addControl(new GLargeMapControl());
    map.addControl(new GOverviewMapControl());
      var point = new GLatLng(31.1611275,121.4188921);

      map.setCenter(point, 10);

      var marker = new GMarker(point);
      map.addOverlay(marker);

      GEvent.addListener(marker, 'mouseover', function() {
        marker.openInfoWindow(
             document.createTextNode("��C�t�͑�w"));
      });
  }
}