private static void VisitTableCell(HtmlTag cell, ExportRow exportRow)
        {
            var tag = cell.TagName().ToLower();
            if (tag != HtmlTagConstants.Td && tag != HtmlTagConstants.Th )
            {
                cell.Children.ForEach(c => VisitTableCell(c, exportRow));
                return;
            }
            var isImage = cell.Children.Any(c => c.TagName().ToLower() == HtmlTagConstants.Img);
            var text = cell.Children.Any() ? cell.ToString() : cell.Text();
            var exportCell = new ExportCell
                             	{
                                    Text =  ExportFromTable.HtmlTagRegex.Replace(text ?? string.Empty, string.Empty),
                                    Markup = isImage ? cell.FirstChild().ToString():string.Empty
                                };

            SetColspan(cell, exportCell);
            exportRow.AddCell(exportCell);
        }