Placing multiple markers on a google map

markers.js

var markers = [
    ['Bondi Beach', -33.890542, 151.274856],
    ['Coogee Beach', -33.923036, 151.259052],
    ['Cronulla Beach', -34.028249, 151.157507],
    ['Manly Beach', -33.80010128657071, 151.28747820854187],
    ['Maroubra Beach', -33.950198, 151.259302]
];

function initializeMaps() {
    var myOptions = {
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        mapTypeControl: false
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
    var infowindow = new google.maps.InfoWindow(); 
    var marker, i;
    var bounds = new google.maps.LatLngBounds();

    for (i = 0; i < markers.length; i++) { 
        var pos = new google.maps.LatLng(markers[i][1], markers[i][2]);
        bounds.extend(pos);
        marker = new google.maps.Marker({
            position: pos,
            map: map,
          //icon: 'http://google-maps-icons.googlecode.com/files/factory.png' change marker
        });
        google.maps.event.addListener(marker, 'click', (function(marker, i) {
            return function() {
                infowindow.setContent(markers[i][0]);
                infowindow.open(map, marker);
            }
        }
    })(marker, i));
    map.fitBounds(bounds);
}
document.body.onload = function () {
    initializeMaps();
}
//http://www.dreamdealer.nl/tutorials/placing_multiple_markers_on_a_google_map.html
<script src="http://maps.google.com/maps/api/js?sensor=false"></script>