How to use quicksearch jquery plugin for a particular column?

I have a gridview on which i want to apply quick-search plugin of jquery.I have implemented it successfully. But i want the search should be only according to a particular column, like:- I have three columns in a row. firstname, lastname, address. Now i want to search for firstname only.But normally quciksearch plugin is searching from whole gridview. I have done it from link :-http://www.misfitgeek.com/2011/06/filtering-an-asp-net-gridview-control-with-jquery/

Please help me as soon as possible. Thanks in advance.

i know my code is not good technically its just completed my task. i am writing the code here

<script type="text/javascript">


    $(document).ready(function() {
        $("#ctl00_InnerBody_txtfirstnamesearch").quicksearch("table tbody tr", {
            selector: 'span',
            delay: 100,
            loaderText: 'Loading...'

        });
    });
</script>

and in gridview :-

<asp:TemplateField HeaderText="First Name">
<ItemTemplate>
<asp:Label Text='<%# Eval("FirstName") %>' ID="lbl" runat="server">
</asp:Label>
</ItemTemplate>
</asp:TemplateField>