Place multiple markers with infowindow on Google Maps API v3, use external links to trigger click and center map on desired location.

gistfile1.js

<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?language=fra&amp;sensor=false"></script> 
<script type="text/javascript">
var map;
var Markers = {};
var infowindow;
var locations = [
	[
		'Samsung Store Madeleine',
		'<strong>Samsung Store Madeleine</strong><p>5 Boulevard Malesherbes, 75008 Paris<br>10h – 20h</p>',
		48.8701925,
		2.322897600000033,
		0
	],
	[
		'Samsung Store Velizy',
		'<strong>Samsung Store Velizy</strong><p>CC Velizy 2 <br>2 Avenue de l\'Europe <br>78140 Vélizy-Villacoublay<br>Niveau 0 Porte 3 <br>10h – 22h</p>',
		48.78126899999999,
		2.219588599999952,
		1
	]
];
var origin = new google.maps.LatLng(locations[0][2], locations[0][3]);

function initialize() {
  var mapOptions = {
    zoom: 13,
    center: origin
  };

  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

	infowindow = new google.maps.InfoWindow();

    for(i=0; i<locations.length; i++) {
    	var position = new google.maps.LatLng(locations[i][2], locations[i][3]);
		var marker = new google.maps.Marker({
			position: position,
			map: map,
		});
		google.maps.event.addListener(marker, 'click', (function(marker, i) {
			return function() {
				infowindow.setContent(locations[i][1]);
				infowindow.setOptions({maxWidth: 200});
				infowindow.open(map, marker);
			}
		}) (marker, i));
		Markers[locations[i][4]] = marker;
	}

	locate(0);

}

function locate(marker_id) {
	var myMarker = Markers[marker_id];
	var markerPosition = myMarker.getPosition();
	map.setCenter(markerPosition);
	google.maps.event.trigger(myMarker, 'click');
}

google.maps.event.addDomListener(window, 'load', initialize);

</script>