I have implemented the Google map successfully. But one more thing has left to do. I need to retrieve the Longitude and Latitude data when the user clicks on the map (any co-ordinates). My entire code looks like this:

<script type=text/javascript src=http://maps.googleapis.com/maps/api/js?sensor=false></script>

<script type=text/javascript>

  var map;

  function initialize() {

      var myLatlng = new google.maps.LatLng(<?=$decimalValueLon?>,<?=$decimalValueLat?>);

      var myOptions = {

      zoom: 17,

      center: myLatlng,

      mapTypeId: google.maps.MapTypeId.SATELLITE

    };





    map = new google.maps.Map(document.getElementById('map_canvas'),

        myOptions);



    // marker STARTS    

    var marker = new google.maps.Marker({

    position: myLatlng, 

    title:Click to view info!

});  

    marker.setMap(map);

    // marker ENDS



    // info-window STARTS   

    var infowindow = new google.maps.InfoWindow({ content: <div class='map_bg_logo'><span style='color:#1270a2;'><b><?=$row->bridge_name?></b> (<?=$row->bridge_no?>)</span><div style='border-top:1px dotted #ccc; height:1px;  margin:5px 0;'></div><span style='color:#555;font-size:11px;'><b>Length: </b><?=$row->bridge_length?> meters</span></div> });

    google.maps.event.addListener(marker, 'click', function() {

        infowindow.open(map,marker);

    });

    // info-window ENDS 

 }



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

</script>` 

Thanks in advance !