function initialize() {
                  if (GBrowserIsCompatible()) {
                  var map = new GMap2(document.getElementById("map"));
                  var center = new GLatLng(51.1467468, 17.1356448);
                  map.setCenter(center, 12);
                  var mapControl = new GMapTypeControl();
                  map.addControl(mapControl);
                  map.addControl(new GLargeMapControl());

                var marker = new GMarker(center, {draggable: true});
               
                GEvent.addListener(marker, "dragstart", function() {
                  map.closeInfoWindow();  
                  });
                 
                GEvent.addListener(marker, "click", function() {
                  marker.openInfoWindowHtml("Testowy tekst!");
                  });

                map.addOverlay(marker);
        }
}