See some sites use Paid version of Google maps, thus I am not sure about that.
But I managed to get something similar to you
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type = "text/javascript" src = "http://google-maps-utility-library-v3.googlecode.com/svn/trunk/styledmarker/src/StyledMarker.js"></script>
<script type="text/javascript">
var markers = [
{
"title": 'Alibaug',
"lat": '18.641400',
"lng": '72.872200',
"description": 'Alibaug is a coastal town and a municipal council in Raigad District in the Konkan region of Maharashtra, India.'
}
,
{
"title": 'Mumbai',
"lat": '18.964700',
"lng": '72.825800',
"description": 'Mumbai formerly Bombay, is the capital city of the Indian state of Maharashtra.'
}
,
{
"title": 'Pune',
"lat": '18.523600',
"lng": '73.847800',
"description": 'Pune is the seventh largest metropolis in India, the second largest in the state of Maharashtra after Mumbai.'
}
];
</script>
<script type="text/javascript">
window.onload = function () {
var mapOptions = {
center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
zoom: 8,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var infoWindow = new google.maps.InfoWindow();
var map = new google.maps.Map(document.getElementById("dvMap"), mapOptions);
var poly = new google.maps.Polyline({ map: map, strokeColor: '#FF8200' });
var lat_lng = new Array();
for (i = 0; i < markers.length; i++) {
var data = markers[i]
var myLatlng = new google.maps.LatLng(data.lat, data.lng);
lat_lng.push(myLatlng);
var marker = new StyledMarker({
styleIcon: new StyledIcon(StyledIconTypes.BUBBLE,
{ color: "2590BA", text: data.title }),
position: myLatlng,
map: map,
title: data.title
});
(function (marker, data) {
google.maps.event.addListener(marker, "click", function (e) {
infoWindow.setContent(data.description);
infoWindow.open(map, marker);
});
})(marker, data);
}
}
</script>
<div id="dvMap" style="width: 500px; height: 500px">
</div>
Demo
