public function isAuthenticated()
		{

			// Already authenticated?
			if ($this->_authenticated) return true;


			// Check session
			if (array_key_exists(self::$_sessionPrefix . $this->_name, $_SESSION)) {

				// Get credentials
				$cred = $_SESSION[self::$_sessionPrefix . $this->_name];
				
				// Init model
				$this->_initModel();

				// Find user
				$modelName = $this->_model;
				$user = $modelName::find("first", array(
							$this->_usernameField => $cred['username'],
							$this->_passwordField => $cred['password']
						));

				// Anything?
				if (is_null($user)) {
					return false;
				}

				// Set result
				$this->_result = new AuthResult(AuthResult::SUCCESS, $user);
				$this->_authenticated = true;
				$this->_user = $user;
				return true;

			}

			// Not authenticated.
			return false;

		}