void ga_RenderHtmlHeader(StringBuilder sb, EventArgs e)
        {
            // Add autodiscovery for CommentRSS feed
            if (EnableCommentRSS)
            {
                sb.AppendFormat("<link rel=\"alternate\" type=\"application/rss+xml\" title=\"{0}\" href=\"{1}\" />\n",
                                "Comments RSS Feed",
                                new Macros().FullUrl(VirtualPathUtility.ToAbsolute("~/feed/comments/")));
            }

            // Render Pingback Link element if enabled
            if (EnableTrackbacks)
            {
                sb.Append(PingBackHandler.GeneratePingbackLinkElement());
            }
        }