function initialize() {
  var latSpan = 52.200776;
  var lngSpan = 19.395583;
  map = new GMap2(document.getElementById("map_canvas"));
  map.setCenter(new GLatLng(latSpan, lngSpan), 13);
  var point = new GLatLng(latSpan,lngSpan);
  map.addOverlay(new GMarker(point));
}