Attributes in Grid- Urgent!

[jeba]

Hi there!
I am using a datagrid with editlinkbutton. So when you edit a row, the values are displayed in textboxes for editing.
Now I want to run some client side Javascript code on a particular textbox. For ex, when you click on a textbox,
I want to show a datepicker by passing the next textbox value also.

<asp:TemplateColumn HeaderText="From Date">
     <ItemTemplate>
               <asp:Label width="80px" ID="lblfdate" runat="server" Text='<%# ConvertDate(DataBinder.Eval(Container.DataItem, "fromdate")) %>' />
    </ItemTemplate>
    <EditItemTemplate>
             <asp:TextBox width="80px" readonly="true" onclick="ShowDpicker(this,popCal,100,200,'1/Jan/1950',txtTdate.value)"                 runat="server" id="txtfdate" Text='<%# DataBinder.Eval(Container.DataItem, "fromdate") %>' />
    </EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="To Date">
         <ItemTemplate>
             <asp:Label width="80px" ID="lblTdate" readonly="true" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Todate") %>' />
             </ItemTemplate>
            <EditItemTemplate>
                    <asp:TextBox width="80px" runat="server" id="txtTdate" Text='<%# DataBinder.Eval(Container.DataItem, "Todate") %>' />
             </EditItemTemplate>
 </asp:TemplateColumn>

When I click on the 'txtfdate', I am getting a client side error saying, 'txtTdate' is not declared.
I understand that ASP.NET engine creates names for the controls
in the datagrid at the runtime and send it to the browser.
My question is, how do I pass the 'txtTdate' in the 'ShowDatepicker' function of 'txtfdate'?

Can you please help me?