[Google Map API (V2.0)] Marker 이동

<script src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=true&amp;key=ABQIAAAA5_gB2Vg-1c-nbEM5V0Y6BhSsl9vjFdX_kmbr4wmtUaFXU66-4BS9peJkYCnYOka-xtNKoS2DurDuAA" type="text/javascript"></script>
<script type="text/javascript">
var marker;
var LatLng;
var map;

   function initialize() {
      if (GBrowserIsCompatible()) {
        map = new GMap2(document.getElementById("map_canvas"));
        LatLng = new GLatLng(37.4136, 127.1260);
        map.setCenter(LatLng , 13);
        map.setUIToDefault();

       markerOptions = { };
       marker = new GMarker(LatLng, markerOptions);
       map.addOverlay(marker);
     }
   }

   function marker_move(latitude, longitude) {
     map.panTo(new GLatLng(latitude, longitude));
     marker.setLatLng(new GLatLng(latitude, longitude));
  }
</script>