var accessMap = function () {
  var that = {
    initialize: function (map, zoom) {
      if (GBrowserIsCompatible()) {
        var map = new GMap2(map);
        var point = new GLatLng(33.804252,132.882180);
        map.setCenter(point, zoom);
        map.addControl(new GSmallMapControl());
        map.addControl(new GMapTypeControl());
        map.addOverlay(new GMarker(point));
      }
    }
  };
  return that;
}

var accessMapObj = accessMap();
document.observe('dom:loaded', function () {
  accessMapObj.initialize($('map1'), 16);
});