Google Maps with update Panel Not Displaying

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ASP.NET

Hi everyone!

I am working on Google Maps and I have successfully displayed it in my web page. We have 24 hours of GPS recorded data. It contains longitude and latitud., Now as the data changes along with time, I have to populate a marker on Google Map on every different time stamp.

My Logic:

I have Taken a <big>DIV </big> to Display Google Map in it, Two Text Boxes For Longitude and latitude respectively. one Java Script To Load Google Map in Div Script is as Follows

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

        var directionsDisplay; 
        var directionsService = new google.maps.DirectionsService();
        function initialize() {
            directionsDisplay = new google.maps.DirectionsRenderer();
           // Retriving Values From Text Boxes
            var slong = document.getElementById('&lt;%= txtLong.ClientID %&gt;').value;
            var sLati = document.getElementById('&lt;%= txtLati.ClientID %&gt;').value;
            var slongSV = 0;

            var myLatlng = new google.maps.LatLng(slong, sLati);
            var myOptions = {
                zoom: 16,
                center: myLatlng,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            }
            var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
            var marker = new google.maps.Marker
    ({
        position: new google.maps.LatLng(slong, sLati),
        map: map,
        title: 'Click me'
    });

So Above Code Work Fine :)

My Problem:

i have DIV in update Panel and i have taken a Timer in which ticks i m loading new Values in Text boxes BUT When Timer Ticks Update Panel Updates And Google Map Go invisible [ Reason no Default Values/ If Defaults Values Than it shows that Default Value].

Need Of Solution:

I want to display that Google Map without any flickers or Smooth like we have in Android phones Navigation app :P, and i should be able to set The coordinates from Server Side or Code Behind

Can Any one Help me on this Please