how to call jquery from code behind

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jQuery

Hi,
i want to hide div using jquery like this

<script type="text/javascript">
        $.fn.myfunction = function () {
            $(document).ready(function () {
                alert("here");
                $("#myMenu").hide();
                $("table[id$='Grd_Stock'] > tbody > tr").bind("contextmenu", function (e) {
                    $("#myMenu").css({ top: e.pageY + "px", left: e.pageX + "px", position: 'absolute' });
                    $("#myMenu").hide();
                });
            });
        }
    </script>

i am calling this function from code behind file.but couldn't successed. please help
Thank you