Edit in JSFiddle

        var g = new google.maps.Geocoder(),
            map, center ;
        g.geocode({
            'address': '霞が関1-1-1'
        }, function(results, status) {
            if (status == google.maps.GeocoderStatus.OK) {
                center = results[0].geometry.location;
                initialize();
            }
        });

        function initialize() {
            var options = {
                center: center,
                zoom: 17,
                mapTypeId: google.maps.MapTypeId.ROADMAP,
                scrollwheel: true,
                panControlOptions: {
                    position: google.maps.ControlPosition.TOP_RIGHT
                },
                zoomControlOptions: {
                    position: google.maps.ControlPosition.TOP_RIGHT
                },
                mapTypeControlOptions: {
                    position: google.maps.ControlPosition.TOP_CENTER
                }
            };
            map = new google.maps.Map(document.getElementById('googlemap'), options);
        }

#googlemap{
    margin:25px;
    height: 300px;
    width: 400px;
    background-color: #FFF;
    z-index: 1;
}

<script type='text/javascript' charset='utf-8' src='http://maps.googleapis.com/maps/api/js?&sensor=false'></script>
<div id="googlemap"></div>