protected void linkExcel_Click(object sender, EventArgs e)
        {
            Response.ClearContent();
            Response.AddHeader("content-disposition", "attachment; filename=www.fanmulu.cn.csv");
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
            Response.ContentType = "application/excel";

            string tab = val_tab.Value.Trim();
            tab = tab.Replace("<tbody>", "").Replace("</tbody>", "");
            tab = Regex.Replace(tab, "<tr[^>]+>", "<tr>", RegexOptions.IgnoreCase|RegexOptions.Singleline);
            tab = Regex.Replace(tab, "<td[^>]+>", "<td>", RegexOptions.IgnoreCase|RegexOptions.Singleline);
            tab = Regex.Replace(tab, "<th[^>]+>", "<th>", RegexOptions.IgnoreCase|RegexOptions.Singleline);
            tab = tab.Replace("<tr>", "").Replace("</tr>", "\r\n");
            tab = tab.Replace("<th>", "\"").Replace("</th>", "\",");
            tab = tab.Replace("<td>", "\"").Replace("</td>", "\",");
            
            tab = tab.Replace("<br>", "/");
            tab = tab.Replace("&ensp;", "");
            tab = tab.Replace(" ", "");


            Response.Write(tab);
            Response.End();
            
        }