Issue regarding Finding a calendar control..

Hi..
[Code Below]


protected void grvOnRowDataBound(object sender, GridViewRowEventArgs e)
    {
        e.Row.Cells[0].Visible = false;
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Label lblCalenderDate = (Label)e.Row.FindControl("lblEmployeeBday");
            TextBox txtBDate = (TextBox)e.Row.FindControl("txtDataBirth");
           
            lblCalenderDate.Text = "<a id=\"chooseday\" onclick=\"showCalendar1('" + txtBDate.ClientID + "','imgCalendar');\" " +
   ...