To know Co-Ordinates, this example help you to find out exact location of place you want.

1.copy code given below.
2. paste it in notepad. it as .html file it and allow restrictions on ActiveX controls if any. to know co-ordinates.
5. Enjoy :)

Code :
Google Maps API v3 - Adding marker on Click and retrieving the co-ordinates in a text box
<script type="text/javascript" src=""></script>
<script type="text/javascript">
var map;    //When using event as a parameter to a function declare map, strictly as a global variable
function initialize()
    var myLatlng = new google.maps.LatLng(18.515118, 73.841025);
      map = new google.maps.Map(document.getElementById("map_canvas"),
        zoom: 13,
        center: myLatlng,
        mapTypeId: google.maps.MapTypeId.HYBRID
    google.maps.event.addListener(map, 'click', function(event)

function placeMarker(location)
    var marker = new google.maps.Marker(
        position: location,
        map: map
    var coords= + ', ' + location.lng().toFixed(6);
    document.getElementById("points").value = coords;
<body onload="initialize()" onunload=GUnload()>
<div id="map_canvas" style="width: 800px; height: 500px"></div>
<div id="text_coords" style="position: absolute; top:60px; left:600px; width:360px; height:600px; text-align:left">
<input type="text" id="points">