Asp.Net jQuery GridView Filter Autocomplete for searching two column or three column

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ASP.NET

Javascript

jQuery

C#3.5

hi to all,
i want to search a data in gridview using autocomplete using jquery.here this my jquery

<script type="text/javascript">
$(document).ready(function() {
      $('#txtID').keyup(function(event) {
            var searchKey = $(this).val().toLowerCase();
            $("#grdEmployee tr td:nth-child(1)").each(function() {
                  var cellText = $(this).text().toLowerCase();
                  if (cellText.indexOf(searchKey) >= 0) {
                        $(this).parent().show();
                  }
                  else {
                        $(this).parent().hide();
                  }
            });
      });
});
</script>   

and my textbox :-

<asp:TextBox ID="txtcustid" runat="server" Width="100"></asp:TextBox>

<asp:GridView
   ID="grdEmployee"
   runat="server"
   AutoGenerateColumns="true"></asp:GridView>

above code only search single column in girdview now i want how to filter all column in gridview.Kindly help me for this
for eg:
i have four column like shirt ,pant,shoe,tshirt

i need to search only shirt and shoe how to i do.