Get the Template value in java Script

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ASP.NET

Javascript

How I get the value of textBox which is in Template field ?

<asp:TemplateField HeaderText="Weightage">
  <ItemTemplate>
    <asp:TextBox ID="txtWtg" runat="server" height="20px" Width="43px">
    </asp:TextBox>
  </ItemTemplate>
</asp:TemplateField>

function checkKRA()
{
  if (document.getElementById(txtWtg).value == '';)
  {
    alert('The KRA can not empty');
    return false;
  }
}

But I can't read the value of textBox.

Kindly appreciate your help ?