function initialize() {
  if (GBrowserIsCompatible()) {
	var map = new GMap2(document.getElementById("map_canvas"));
	map.setCenter(new GLatLng(51.501582, -2.572013), 13);
	map.addControl(new GSmallMapControl());
	map.addControl(new GMapTypeControl());

	// Create a base icon for all of our markers that specifies the
	// shadow, icon dimensions, etc.
	var baseIcon = new GIcon();
	baseIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
	baseIcon.iconSize = new GSize(20, 34);
	baseIcon.shadowSize = new GSize(37, 34);
	baseIcon.iconAnchor = new GPoint(9, 34);
	baseIcon.infoWindowAnchor = new GPoint(9, 2);
	baseIcon.infoShadowAnchor = new GPoint(18, 25);

	// Creates a marker whose info window displays the letter corresponding
	// to the given index.
	function createMarker(point, index) {
	  // Create a lettered icon for this point using our icon class
          var letter = index;
	  var letteredIcon = new GIcon(baseIcon);
	  letteredIcon.image = "http://www.northbristolstudentlets.co.uk/marker" + letter + ".png";

	  // Set up our GMarkerOptions object
	  markerOptions = { icon:letteredIcon };
	  var marker = new GMarker(point, markerOptions);

	  GEvent.addListener(marker, "click", function() {
		marker.openInfoWindowHtml("<b>NBSL " + letter + "</b>");
	  });
	  return marker;
	}

	// Add 10 markers to the map at random locations
	var bounds = map.getBounds();
	var southWest = bounds.getSouthWest();
	var northEast = bounds.getNorthEast();
	var lngSpan = northEast.lng() - southWest.lng();
	var latSpan = northEast.lat() - southWest.lat();
	//for (var i = 0; i < 10; i++) {
	//  var latlng = new GLatLng(southWest.lat() + latSpan * Math.random(),
	//	southWest.lng() + lngSpan * Math.random());
	//  map.addOverlay(createMarker(latlng, i));
	//}
	var latlng = new GLatLng(51.491376, -2.572159);	
	map.addOverlay(createMarker(latlng, 1));
	
	var latlng = new GLatLng(51.509456, -2.565080);	
	map.addOverlay(createMarker(latlng, 2));
	
	var latlng = new GLatLng(51.501408, -2.588968);	
	map.addOverlay(createMarker(latlng, 3));
	
	var latlng = new GLatLng(51.489507, -2.573763);	
	map.addOverlay(createMarker(latlng, 4));

	var latlng = new GLatLng(51.489998, -2.576275);	
	map.addOverlay(createMarker(latlng, 5));

	var latlng = new GLatLng(51.499369, -2.590324);	
	map.addOverlay(createMarker(latlng, 6));
	
	var latlng = new GLatLng(51.501459, -2.571178);	
	map.addOverlay(createMarker(latlng, 7));
	
	var latlng = new GLatLng(51.501459, -2.571778);	
	map.addOverlay(createMarker(latlng, 8));	
	
	var latlng = new GLatLng(51.509261, -2.562219);	
	map.addOverlay(createMarker(latlng, 9));	
	
	var latlng = new GLatLng(51.509261, -2.562899);	
	map.addOverlay(createMarker(latlng, 10));
	
	var latlng = new GLatLng(51.502589, -2.571997);	
	map.addOverlay(createMarker(latlng, 11));	
  }
}