Open a WebPage in fullscreen mode using JavaScript in ASP.Net

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script type="text/javascript" src="http://www.ailis.de/~k/scripts/jquery/plugins/fullscreen.js"></script>
    <script type="text/javascript">
        $("#btn").live("click", function () {
            $(document).fullScreen(true);
        });
    </script>
    <input type="button" id="btn" value="btn" />

i want to work on page load not on button click please advice how it can be called on page load