how to get the ID of the ASP control inside a table inside gridview

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ASP.NET

Javascript

ASP.NET4

Hi everyone..
I have a tircky question to ask..
I want to get the ID of the ASP control inside a table and the table is inside a gridview...
Here's the code to give you a better idea...

<asp:GridView ID="gvTest" runat="server">
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <table width="100%">
                            <tr>
                                <td><asp:Label ID="lblTestLabel" runat="server"></asp:Label></td>
                            </tr>
                        </table>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

I have no problem getting the control inside a gridview and here's the code

function TestFunction(sender, e)
{
     var gridview = document.getElementById('gvTest.ClientID');
     var i = gridview.rows.length - 1;
     var node1 = gridview.rows[i].cells[1].children[0];
 }

But i need to put table inside gridview for formatting issues and when i did it, the controls are not accessible ....
So my question is how can i get the ID of the ASP label (in this case, lblTestLabel") in javascript??
Answers and suggestions are very much appreciated..