Writing ASP Chat using JavaScript and XML (Part 2)

<script language="JavaScript" runat="server" src="Settings.js"></script>
<script language="JavaScript" runat="server" src="MessagesClass.js"></script>
<script language="JavaScript" runat="server" src="LimitedXmlClass.js"></script>
<script language="JavaScript" runat="server" src="IncorrectInputFilter.js"></script>
<script language="JavaScript" runat="server" src="SessionClass.js"></script>
<script language="JavaScript" runat="server" src="SharedXMLClass.js"></script>
<script language="JavaScript" runat="server" src="UserManagerClass.js"></script>
<script language="JavaScript" runat="server">
/**
 *  Addition of a new message for the chat.
 */
function addMessage(sessionID, strMessage, moodType) {
	var clientIP = Request.ServerVariables("REMOTE_ADDR");
	var objMessages = new Messages;
	var strNick = getUserNick(sessionID);
	if(typeof(strNick) != "undefined") {
		objMessages.addMessage(clientIP, strNick, strMessage, moodType)
	}
}

/**
 *  Addition of a new system message for the chat.
 */
function addSysMessage(strMessage) {
	var objMessages = new Messages;
	objMessages.addSysMessage(strMessage)
}

/**
 *  Formats all messages as HTML for user friendly representation.
 */
function formatAll() {
	var objMessages = new Messages;
	var strMessages = objMessages.formatAll();
	return strMessages;
}

/**
 *  Adds user to active users list. If user exists and previous IP address 
 * is different deny loginning.
 *  @return Session unique id or -1 if fails.
 */
function loginUser(strUserName) {
	var sessionID = -1;
	strUserName = Server.HTMLEncode(strUserName);
	var userManager = new UserManager;
	var alreadyExist = userManager.getSessionID(strUserName);
	var clientIP = Request.ServerVariables("REMOTE_ADDR");
	sessionID = userManager.loginUser(strUserName, clientIP);
	if(alreadyExist == -1 && sessionID > -1) {
		strMessage = "Welcome " + strUserName + "!"
		addSysMessage(strMessage);
	}
	return sessionID;
}

/**
 *  Removes user from active users list.
 *  @param session unique id.
 */
function logoutUser(sessionID) {
	var userManager = new UserManager;
	if(sessionID > -1) {
		var strUserName = userManager.getUserNick(sessionID);
		if(typeof(strUserName) != "undefined") {
			userManager.removeSession(sessionID);
			var strMessage = strUserName + " went from here!"
			addSysMessage(strMessage);
		}
	}
}

/**
 *  Extracts user name by session id.
 */
function getUserNick(sessionID) {
	var userManager = new UserManager;
	return userManager.getUserNick(sessionID);
}

/**
 *  Formats users list for specified session.
 */
function formatUsers(sessionID) {
	var userManager = new UserManager;
	//userManager.save("C:\\Documents and Settings\\All Users.WINDOWS\\Documents\\test.xml");
	return userManager.formatUsers(sessionID);
}

/**
 *  Retrieves quantity of currently logged users.
 */
function getActiveUsersCount() {
	var userManager = new UserManager;
	return userManager.getUsersCount();
}
</script>