Index: branches/5.2.x/core/kernel/managers/cache_manager.php
===================================================================
diff -u -N -r14560 -r14585
--- branches/5.2.x/core/kernel/managers/cache_manager.php	(.../cache_manager.php)	(revision 14560)
+++ branches/5.2.x/core/kernel/managers/cache_manager.php	(.../cache_manager.php)	(revision 14585)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: cache_manager.php 14560 2011-09-19 21:01:58Z alex $
+* @version	$Id: cache_manager.php 14585 2011-09-24 12:04:17Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2011 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -190,9 +190,21 @@
 			return $res['VariableValue'];
 		}
 
+		trigger_error('Usage of undefined configuration variable "<strong>' . $name . '</strong>"', E_USER_NOTICE);
+
 		return false;
 	}
 
+	function SetConfigValue($name, $value)
+	{
+		$this->configVariables[$name] = $value;
+
+		$fields_hash = Array ('VariableValue' => $value);
+		$this->Conn->doUpdate($fields_hash, TABLE_PREFIX . 'ConfigurationValues', 'VariableName = ' . $this->Conn->qstr($name));
+
+		$this->DeleteUnitCache();
+	}
+	
 	/**
 	 * Loads data, that was cached during unit config parsing
 	 *