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diff --git a/inc/classes/main/filter/verifier/class_UserNameVerifierFilter.php b/inc/classes/main/filter/verifier/class_UserNameVerifierFilter.php
new file mode 100644
index 000000000..7d0bde9e0
--- /dev/null
+++ b/inc/classes/main/filter/verifier/class_UserNameVerifierFilter.php
@@ -0,0 +1,139 @@
+<?php
+/**
+ * A concrete filter for verfying the username. This filter may intercept the
+ * filter chain if no username is given or if the supplied username has an
+ * invalid form. It could also intercept the filter chain if the username was
+ * not found.
+ *
+ * @author		Roland Haeder <webmaster@ship-simu.org>
+ * @version		0.0.0
+ * @copyright	Copyright (c) 2007, 2008 Roland Haeder, this is free software
+ * @license		GNU GPL 3.0 or any newer version
+ * @link		http://www.ship-simu.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+class UserNameVerifierFilter extends BaseFilter implements Filterable {
+	/**
+	 * Protected constructor
+	 *
+	 * @return	void
+	 */
+	protected function __construct () {
+		// Call parent constructor
+		parent::__construct(__CLASS__);
+	}
+
+	/**
+	 * Creates an instance of this filter class
+	 *
+	 * @return	$filterInstance		An instance of this filter class
+	 */
+	public final static function createUserNameVerifierFilter () {
+		// Get a new instance
+		$filterInstance = new UserNameVerifierFilter();
+
+		// Return the instance
+		return $filterInstance;
+	}
+
+	/**
+	 * Executes the filter with given request and response objects
+	 *
+	 * @param	$requestInstance	An instance of a class with an Requestable interface
+	 * @param	$responseInstance	An instance of a class with an Responseable interface
+	 * @return	void
+	 */
+	public function execute (Requestable $requestInstance, Responseable $responseInstance) {
+		// Get username from request
+		$userName = $requestInstance->getRequestElement('username');
+
+		// Is the username set?
+		if (is_null($userName)) {
+			// Not found in form so stop the filtering process
+			$requestInstance->requestIsValid(false);
+
+			// Add a message to the response
+			$responseInstance->addFatalMessage('username_unset');
+
+			// Abort here
+			return false;
+		} elseif (empty($userName)) {
+			// Empty field!
+			$requestInstance->requestIsValid(false);
+
+			// Add a message to the response
+			$responseInstance->addFatalMessage('username_empty');
+
+			// Abort here
+			return false;
+		} elseif (!$this->ifUserNameIsTaken($userName)) {
+			// Username is already taken
+			$requestInstance->requestIsValid(false);
+
+			// Add a message to the response
+			$responseInstance->addFatalMessage('username_not_found');
+
+			// Abort here
+			return false;
+		}
+	}
+
+	/**
+	 * Check wether the username as already been taken
+	 *
+	 * @param	$userName		Username to check for existence
+	 * @return	$alreadyTaken	Wether the username has been taken
+	 */
+	private function ifUserNameIsTaken ($userName) {
+		// Default is already taken
+		$alreadyTaken = true;
+
+		// Initialize instance
+		$userInstance = null;
+
+		// Get a registry instance
+		$registry = Registry::getRegistry();
+
+		// Is the user already there?
+		if ($registry->instanceExists('user')) {
+			// Use the instance for checking for the email
+			$userInstance = $registry->getInstance('user');
+			$userInstance->setUserName($userName);
+		} else {
+			// If this instance is created then the username *does* exist
+			try {
+				// Get a new instance
+				$userInstance = call_user_func_array(array($this->getConfigInstance()->readConfig('user_class'), 'createMemberByUsername'), array($userName));
+
+				// Remember this user instance in our registry for later usage
+				$registry->addInstance('user', $userInstance);
+			} catch (UsernameMissingException $e) {
+				// User was not found
+			}
+		}
+
+		// Does the username exist?
+		if ((is_null($userInstance)) || (!$userInstance->ifUsernameExists())) {
+			// This username is still available
+			$alreadyTaken = false;
+		} // END - if
+
+		// Return the result
+		return $alreadyTaken;
+	}
+}
+
+// [EOF]
+?>