Preserve scroll position of DIV in UpdatePanel through Postback in asp.net

<script type="text/javascript">

    window.onload = function () {

        var div = document.getElementById("divid");

        var div_position = document.getElementById("div_position");

        var position = parseInt('<%=Request.Form["div_position"] %>');

        if (isNaN(position)) {

            position = 0;

        }

        div.scrollTop = position;

        div.onscroll = function () {

            div_position.value = div.scrollTop;

        };

    };

</script>

  <div id="divid" style="width:97%; overflow:auto; min-height: 430px; max-height: 430px;">

// Your Code

</div>

<input type="hidden" id="Hidden1" name="div_position" />