using Google map inside update panel

I  have tried to use the Google Map inside an updatepanel and it ended up giving me strange JavaScript error "javascript - Unable to get value of the property 'offsetWidth': object is null or undefined ".
After some research I found that it occurred when you have build your map when the Maps API JavaScript has not loaded. I as able to solve the issue when I load the map as displayed below.

 <script type="text/javascript">
        function initialize() {
            var mapOptions = {
                zoom: 6,
                center: new google.maps.LatLng(7.0000, 81.0000),
                mapTypeId: google.maps.MapTypeId.ROADMAP
            }
            var map = new google.maps.Map(document.getElementById("googleMap"), mapOptions);
        
            });
        }

        function loadScript() {
            var script = document.createElement("script");
            script.type = "text/javascript";
            script.src = "http://maps.googleapis.com/maps/api/js?key=<your_api_key>&sensor=false&callback=initialize";
            document.body.appendChild(script);
        }

        window.onload = loadScript;
    </script>

for more information refer http://stackoverflow.com/questions/5478450/google-map-error-a-is-null

Cheers
Samith