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HTML 

              
                <html>
	<head>
		<title>Ultimate Guide to Openlayers: Free Maps for the Web</title>
		<style>
		#map {
			height: 500px;
			width: 500px;
		}
		</style>
		<script src="//maps.google.com/maps/api/js?v=3.2&sensor=false"></script>
		<script src="https://openlayers.org/dev/OpenLayers.js"></script>
	</head>
	<body>
		<div id="map"></div>
		<script>
			//Convert the coordinates into GPS format
			var cent_lonlat = new OpenLayers.LonLat(77.2300, 28.6100)
				.transform(new OpenLayers.Projection('EPSG:4326'), new OpenLayers.Projection('EPSG:3857'));

			//The layers
			var osm_layer = new OpenLayers.Layer.OSM();

			//Google Roadmap
			var gphr = new OpenLayers.Layer.Google(
                        "Google Roadmap", {
                            type: google.maps.MapTypeId.ROADMAP
                        }
                    );
			//Google Physical
			var gphy = new OpenLayers.Layer.Google(
				"Google Physical", {
					type: google.maps.MapTypeId.TERRAIN
				}
			);
			//Google Hybrid
			var ghyb = new OpenLayers.Layer.Google(
				"Google Hybrid", {
					type: google.maps.MapTypeId.HYBRID
				}
			);
			//Google Satellite
			var gsat = new OpenLayers.Layer.Google(
				"Google Satellite", {
					type: google.maps.MapTypeId.SATELLITE
				}
			);

			var map = new OpenLayers.Map({
				div: "map",
				displayProjection: new OpenLayers.Projection("EPSG:4326", "EPSG:3857"),
				center: cent_lonlat,
				zoom: 5,
				layers: [osm_layer, gphr, gphy, ghyb, gsat]
			});
			var baseLayer = map.getLayersByName("Google Hybrid")[0];
			map.setBaseLayer(baseLayer);

			//Add the Layer switcher control
			//to switch between layers
			map.addControl(new OpenLayers.Control.LayerSwitcher());
			map.addControl(new OpenLayers.Control.PanZoomBar());
		</script>
	</body>
</html>
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999px

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