Ajax and umbraco

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public class AjaxService
{
	public AjaxService() {}

	// Just a test method
	[AjaxPro.AjaxMethod]
	public DateTime GetServerTime()
	{
		return DateTime.Now;
	}

	[AjaxPro.AjaxMethod]
	public static string InsertNewCommentAndGetAllCommentsAsHtml(int nodeId, string name, string email, string website, string comment)
	{
		// Get the node wich we want to add a child (comment) to
		umbraco.presentation.nodeFactory.Node node = new umbraco.presentation.nodeFactory.Node(nodeId);

		// A little security check, just to make sure people can't make comment's every where
		if (node.NodeTypeAlias != "BlogPost")
		{
			throw new Exception("You can not add new nodes under this Document Type: " + node.NodeTypeAlias);
		}

		// Getting the documenttype for a comment
		DocumentType documentType = DocumentType.GetByAlias("BlogPostComment");

		// Use the admin (user with id 0) user from umbraco to create the node
		umbraco.BusinessLogic.User user = new umbraco.BusinessLogic.User(0);

		// the new comment node should have a name
		// we use the timestamp (ISO 8601) as name so it's unique
		string commentName = DateTime.Now.ToString("s");

		// Here we are creating the new comment node/document
		Document post = Document.MakeNew(commentName, documentType, user, nodeId);

		// Setting the properties
		post.getProperty("name").Value = name;
		post.getProperty("email").Value = email;
		post.getProperty("website").Value = website;
		post.getProperty("bodyText").Value = comment;
		post.getProperty("umbracoNaviHide").Value = "1";

		// Flag the node/document for publishing
		// Hereby creating a new version, using the user
		post.Publish(user);

		umbraco.library.PublishSingleNode(post.Id);
		
		return HtmlHelper.GetCommentsAsHtml(nodeId, post.Id);
	}

	[AjaxPro.AjaxMethod]
	public static string GetCommentsAsHtml(int nodeId)
	{
		return HtmlHelper.GetCommentsAsHtml(nodeId, -1);
	}

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<script type="text/javascript" src="/ajaxpro/prototype.ashx"></script>
<script type="text/javascript" src="/ajaxpro/core.ashx"></script>
<script type="text/javascript" src="/ajaxpro/converter.ashx"></script>
<script type="text/javascript" src="/ajaxpro/CPalm.Website.AjaxService,CPalm.Website.ashx"></script>
<!-- all script above is generated by the  Ajax.NET Professional library -->
<script src="/media/comment.js" type="text/javascript"></script>

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function postComment() {
	CPalm.Website.AjaxService.InsertNewCommentAndGetAllCommentsAsHtml(1023, "Name", "Email", "http://www.cpalm.dk", "This is my comment", InsertNewCommentAndGetAllCommentsAsHtml_callback);
}

function InsertNewCommentAndGetAllCommentsAsHtml_callback(res)
{
	if (res.error != null)
	{
		alert(res.error.Message);
	}
	else
	{
		alert("The C# method returned: " + res.value);
	}
}

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public class HtmlHelper
{
	public HtmlHelper() { }

	public static string GetHeadingAsImage(string headingText)
	{
		return "<h1><img width=\"484\" height=\"30\" src=\"/ImageGen.aspx?Text=" +
			headingText + "&amp;Width=484&amp;Height=30&amp;FontSize=18&amp;" +
			"FontColor=ffba00&amp;BgColor=333333&amp;Font=Trebuchet%20MS\" alt=\"" +
			headingText + "\" /></h1><div class=\"stripe\"></div>";
	}

	// output dates, where the day gets a st, nd or rd
	// Examples: June 07th, 2006 || January 22nd, 2006 || January 21st, 2006
	public static string GetOutPutDate(DateTime date)
	{
		string year		= date.ToString("yyyy");
		string month	= date.ToString("MMMM");
		string day		= date.ToString("dd");

		if (day.EndsWith("1"))
		{
			day += "st";
		}
		else if (day.EndsWith("2"))
		{
			day += "nd";
		}
		else if (day.EndsWith("3"))
		{
			day += "rd";
		}
		else if (day.EndsWith("4"))
		{
			// Houston, we have a problem! :-)
		}

		return month + " " + day + ", " + year;
	}

	public static string GetCommentsAsHtml(int nodeId)
	{
		return GetCommentsAsHtml(nodeId, -1);
	}

	public static string GetCommentsAsHtml(int nodeId, int markId)
	{

		umbraco.presentation.nodeFactory.Node node = new umbraco.presentation.nodeFactory.Node(nodeId);
		umbraco.presentation.nodeFactory.Nodes nodes = node.Children;

		StringBuilder sb = new StringBuilder();

		int i = 0;
		foreach (umbraco.presentation.nodeFactory.Node child in nodes)
		{
			if (child.NodeTypeAlias != "BlogPostComment")
			{
				continue; // if is not a comment, go to next child (it could be a codeexample)
			}
			i++;
			sb.Append("	<div class=\"commententry\"");
			if (child.Id == markId)
			{
				sb.Append(" id=\"lastInserted\"");
			}
			sb.Append(">");
			sb.Append("		<p class=\"author\"><a href=\"#" + i + "\" name=\"" + i + "\">#" + i + "</a> - ");
			if (child.GetProperty("website").Value != string.Empty)
			{
				sb.Append("<a href=\"" + child.GetProperty("website").Value + "\" target=\"_blank\">");
			}
			
			sb.Append(child.GetProperty("name").Value);
			
			if (child.GetProperty("website").Value != string.Empty)
			{
				sb.Append("</a>");
			}
			sb.Append(" on " + GetOutPutDate(child.CreateDate) + " " + child.CreateDate.ToString("HH:mm") + "</p>");
			string bodyText = child.GetProperty("bodyText").Value;
			bodyText = System.Web.HttpUtility.HtmlEncode(bodyText);
			bodyText = bodyText.Replace("\n", "<br>");
			sb.Append("		<div class=\"commentbody\"><p>" + bodyText + "</p></div>");
			sb.Append("	</div>");
		}
		return sb.ToString();
	}
}