javascript - map.setCenter() 関数が正しく動作しない

Question

これがコードです...

<script src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script>
var geocoder;
var map;

function initialize() {
    geocoder = new google.maps.Geocoder();        
    var address = "new delhi";

    geocoder.geocode( { 'address': address}, function(results, status) {
        if (status == google.maps.GeocoderStatus.OK) {        
            var latitude = results[0].geometry.location.lat();
            var longitude = results[0].geometry.location.lng();
            alert(latitude);
            alert(longitude);
            map.setCenter(new GLatLng(latitude, longitude));

            var marker = new google.maps.Marker({
                map: map,
                position: results[0].geometry.location
            });
            var latlng = new google.maps.LatLng(latitude, longitude);
            var mapOptions = {
                zoom: 8,
                center: latlng,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            }
            map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
        } 
    });
    google.maps.event.addDomListener(window, 'load', initialize);    
}
</script>