/**
	 * check if the username exist
	 * @param userName: user name to create account
	 * @return true if the user name exist
	 */
	public boolean isUserNameExist (String userName) {
		Users user = usersDao.getOneByUserName(userName);
		JforumUsers jforumUser = jforumUsersDao.getOneByName(userName);
		
		return user == null && jforumUser == null ? false : true;
	}