customMapType1 is not defined - Admin side

Uncaught ReferenceError: customMapType1 is not defined index.php:3405

map.mapTypes.set('customMapType1', customMapType1);

<script type="text/javascript" >//<![CDATA[
var initialLocation;
var spblocation;
var browserSupportFlag =  new Boolean();
var map;
var infowindow;
var marker;
var geocoder;
var inputPlacesAC;
function initialize() {
infowindow = new google.maps.InfoWindow();
geocoder = new google.maps.Geocoder();
spblocation = new google.maps.LatLng(59.9388, 30.3158);
var myOptions = {
    zoom: 14,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
      panControl: true,
      zoomControl: true,
      zoomControlOptions: {
            style: google.maps.ZoomControlStyle.DEFAULT
          },
      mapTypeControl: true,
      mapTypeControlOptions: {
      mapTypeIds: [
	  google.maps.MapTypeId.ROADMAP,
	  google.maps.MapTypeId.TERRAIN,
	  google.maps.MapTypeId.SATELLITE,
	  google.maps.MapTypeId.HYBRID
	 ,'osm'
	  ,'customMapType1'
	]
      },
      scaleControl: false,
      streetViewControl: false,
      rotateControl: false,
      overviewMapControl: true
  };
 var openStreetType = new google.maps.ImageMapType({
  getTileUrl: function(ll, z) {
	var X = ll.x % (1 << z);  // wrap
	return "http://tile.openstreetmap.org/" + z + "/" + X + "/" + ll.y + ".png";
  },
  tileSize: new google.maps.Size(256, 256),
  isPng: true,
  maxZoom: 18,
  name: "OSM",
  alt: "OpenStreetMap Layer"
}); 
    map = new google.maps.Map(document.getElementById("GMapsID"), myOptions);
 map.mapTypes.set('osm', openStreetType);
 map.mapTypes.set('customMapType1', customMapType1);
initialLocation = new google.maps.LatLng(35.353132, -94.43468999999999);
  map.setCenter(initialLocation);
  marker = new google.maps.Marker({
      position: initialLocation, 
      draggable:true, 
      map: map, 
      animation: google.maps.Animation.DROP,
      title:"First Baptist Church"
  });
    google.maps.event.addListener(marker, 'drag', function(event) {
      document.forms.adminForm.jform_longitude.value = event.latLng.lng();
      document.forms.adminForm.jform_latitude.value = event.latLng.lat();
    });
    google.maps.event.addListener(map, 'click', function(event) {
      marker.setPosition(event.latLng);
      document.forms.adminForm.jform_longitude.value = event.latLng.lng();
      document.forms.adminForm.jform_latitude.value = event.latLng.lat();
    });
  inputPlacesAC = document.getElementById('searchTextField');
  var autocompletePlaces = new google.maps.places.Autocomplete(inputPlacesAC);
  autocompletePlaces.bindTo('bounds', map);
  google.maps.event.addListener(autocompletePlaces, 'place_changed', function() {
  var place = autocompletePlaces.getPlace();
  var markerPlacesACText = place.name;
  if (place.geometry.viewport) 
  {
    map.fitBounds(place.geometry.viewport);
  } 
  else 
  {
    map.setCenter(place.geometry.location);
    map.setZoom(17);
  }
  marker.setPosition(place.geometry.location);
  marker.setTitle(markerPlacesACText);
  marker.setMap(map);
  document.forms.adminForm.jform_longitude.value = place.geometry.location.lng();
  document.forms.adminForm.jform_latitude.value = place.geometry.location.lat();
  });
};
function loadScript() {
  var script = document.createElement("script");
  script.type = "text/javascript";
  script.src = "http://maps.googleapis.com/maps/api/js?sensor=false&libraries=places&callback=initialize";
  document.body.appendChild(script);
};
function handleNoGeolocation(errorFlag) {
  if (errorFlag == true) {
    initialLocation = spblocation;
  } else {
    initialLocation = spblocation;
  }
  map.setCenter(initialLocation);
  marker.setPosition(initialLocation);
};
function Do_Find() {  geocoder.geocode( { 'address': inputPlacesAC.value}, function(results, status) {
  if (status == google.maps.GeocoderStatus.OK) {
    var latlngFind = new google.maps.LatLng(results[0].geometry.location.lat(), results[0].geometry.location.lng());
    map.setCenter(latlngFind);
    map.setZoom(17);
  marker.setPosition(latlngFind);
  marker.setTitle(inputPlacesAC.value);
  marker.setMap(map);
  document.forms.adminForm.jform_longitude.value = latlngFind.lng();
  document.forms.adminForm.jform_latitude.value = latlngFind.lat();
  }
  else
  {
    alert("Geocode was not successful for the following reason: " + status + "\n" + "for address: "+inputPlacesAC.value);
  }
});
};
window.onload = loadScript;
//]]></script>