[Google Map API (V3.0)] Marker 이동

<script type="text/javascript" src="http://maps.google.co.kr/maps/api/js?sensor=false"></script>
<script type="text/javascript">
var marker;
var map;
  function initialize() {
    var myLatlng = new google.maps.LatLng(37.4136, 127.1260);
    var myOptions = {
      zoom: 16,
      center: myLatlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP,
      navigationControl: true,
      navigationControlOptions: {style: google.maps.NavigationControlStyle.ZOOM_PAN}
    }
    map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);

    marker = new google.maps.Marker({
        position: myLatlng,
        map: map
    });

}
function marker_move(latitude, longitude) {
    map.panTo(new google.maps.LatLng(latitude, longitude));
    marker.setPosition(new google.maps.LatLng(latitude, longitude));
}
</script>