Google Maps v3 API Center on Multiple Markers

mapInital.js

	<script>
		/*
		 * Google Maps: Zoom-to-Fit Markers (v3)
		 * http://salman-w.blogspot.com/2011/03/zoom-to-fit-all-markers-on-google-map.html
		 */
		function map_initialize() {
			var cwc2011_venue_data = [
				{
					name: "Eden Gardens, India",
					latlng: new google.maps.LatLng(22.564444, 88.343333)
				},
				{
					name: "Feroz Shah Kotla, India",
					latlng: new google.maps.LatLng(28.637778, 77.243056)
				},
				{
					name: "M. A. Chidambaram Stadium, India",
					latlng: new google.maps.LatLng(13.062778, 80.279444)
				},
				{
					name: "M. Chinnaswamy Stadium, India",
					latlng: new google.maps.LatLng(12.978806, 77.599556)
				},
				{
					name: "Mahinda Rajapaksa International Stadium, Sri Lanka",
					latlng: new google.maps.LatLng(6.804265, 79.987488)
				},
				{
					name: "Narayanganj Osmani Stadium, Bangladesh",
					latlng: new google.maps.LatLng(23.650161, 90.488811)
				},
				{
					name: "Pallekele International Cricket Stadium, Sri Lanka",
					latlng: new google.maps.LatLng(7.280278, 80.722222)
				},
				{
					name: "Punjab Cricket Association Stadium, India",
					latlng: new google.maps.LatLng(30.690858, 76.737258)
				},
				{
					name: "R. Premadasa Stadium, Sri Lanka",
					latlng: new google.maps.LatLng(6.939667, 79.872028)
				},
				{
					name: "Sardar Patel Stadium, India",
					latlng: new google.maps.LatLng(23.091667, 72.5975)
				},
				{
					name: "Sher-e-Bangla Cricket Stadium, Bangladesh",
					latlng: new google.maps.LatLng(23.806917, 90.363583)
				},
				{
					name: "Sinhalese Sports Club Ground, Sri Lanka",
					latlng: new google.maps.LatLng(6.905922, 79.869403)
				},
				{
					name: "Vidarbha Cricket Association Stadium, India",
					latlng: new google.maps.LatLng(21.013572, 79.039603)
				},
				{
					name: "Wankhede Stadium, India",
					latlng: new google.maps.LatLng(18.938917, 72.825722)
				},
				{
					name: "Zohur Ahmed Chowdhury Stadium, Bangladesh",
					latlng: new google.maps.LatLng(22.355803, 91.767919)
				}
			];
			var map = new google.maps.Map(document.getElementById("mapdiv"), {
				center: new google.maps.LatLng(0, 0),
				zoom: 0,
				mapTypeId: google.maps.MapTypeId.ROADMAP
			});
			for (var i = 0; i < cwc2011_venue_data.length; i++) {
				new google.maps.Marker({
					position: cwc2011_venue_data[i].latlng,
					map: map,
					title: cwc2011_venue_data[i].name
				});
			}
			var latlngbounds = new google.maps.LatLngBounds();
			for (var i = 0; i < cwc2011_venue_data.length; i++) {
				latlngbounds.extend(cwc2011_venue_data[i].latlng);
			}
			map.fitBounds(latlngbounds);
			new google.maps.Rectangle({
				bounds: latlngbounds,
				map: map,
				fillColor: "#000000",
				fillOpacity: 0.2,
				strokeWeight: 0
			});
		}
		google.maps.event.addDomListener(window, 'load', map_initialize);
	</script>