var map = null;
var point = null;
var geocoder = null;
 
function initialize(lat, lng) {
  if (lat != "" && lng != "") {
    if (GBrowserIsCompatible()) {
      map = new GMap2(document.getElementById("map_canvas"));
      point = new GLatLng(lat, lng);
      map.removeMapType(G_HYBRID_MAP); 
      map.setCenter(point, 13);
      map.addControl(new GLargeMapControl()); 
      map.addOverlay(new GMarker(point));
      geocoder = new GClientGeocoder();
    }
  }
}