how to get rowindex of datagrid using jquery

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jQuery

Hi,
Actually i want to show contextmenu on right click of datagrid cell. my contextmenu is showing but i want to get rowindex of row which is clicked by user.i have a hidden field bind in datagrid.i want to get value of hiddenfield of selected rowindex.

$(document).ready(function () {
            try {
                $("#myMenu").hide();
                $("table[id$='Grd_Stock'] > tbody > tr").bind("contextmenu", function (e) {
                    $("#myMenu").hide();
                    e.preventDefault();

//it shows text of first cell of selected row
                    rowid = $(this).children(':first-child').text();

//it shows undefined

var hv = $('#hd_lead_code').attr("value");
                    alert(hv);

});



hd_lead_code is id of my hidden field
#myMenu is my context menu like this:

<div id="myMenu1" class="contextMenu">
                            <table style="width:100%;">
                            <tr><td önclick="fnView();">View Product</td></tr>
                            <tr><td önclick="fnDelete();">Delete Product</td></tr>
                            <tr><td>Team Members</td></tr>
                            <tr><td><asp:DropDownList ID="ddlmembers" runat="server" Width="110px"></td></tr>
                            <tr><td><asp:Button ID="btnassign" runat="server" Width="100px" Text="Assign" 
                                    onclick="btnassign_Click" /></td></tr>
                            </table>
                        </div>

Html code of hidden field:

<asp:TemplateField HeaderText="Cust Name" SortExpression="lead_name">
                                            <ItemTemplate>
                                                <asp:LinkButton ID="lbtn_name" Width="200px" CssClass="grdlinkbtn" runat="server"
                                                    OnClick="lbtn_name_click" Text='<%#Eval("lead_name") %>' CausesValidation="false" ></asp:LinkButton>
                                                <asp:HiddenField ID="hd_lead_code" Value='<%#Eval("lead_code") %>' runat="server" />
                                            </ItemTemplate>
                                            <ItemStyle Width="200px" />
                                            <HeaderStyle Font-Bold="true" />
                                        </asp:TemplateField>