public IHtmlNode HeaderCellTag(string dayOfWeek)
{
IHtmlNode cell = new HtmlTag("th")
.Attributes(new { scope = "col", title = dayOfWeek})
.Text(dayOfWeek.Substring(0, 1));
if (dayOfWeek.Length > 3)
cell.Attribute("abbr", dayOfWeek.Substring(0, 3));
return cell;
}