Index: branches/5.2.x/core/units/logs/change_logs/change_log_eh.php
===================================================================
diff -u -N -r14244 -r14639
--- branches/5.2.x/core/units/logs/change_logs/change_log_eh.php	(.../change_log_eh.php)	(revision 14244)
+++ branches/5.2.x/core/units/logs/change_logs/change_log_eh.php	(.../change_log_eh.php)	(revision 14639)
@@ -1,22 +1,61 @@
 <?php
+/**
+* @version	$Id: change_log_eh.php 14639 2011-10-05 14:17:02Z alex $
+* @package	In-Portal
+* @copyright	Copyright (C) 1997 - 2011 Intechnic. All rights reserved.
+* @license      GNU/GPL
+* In-Portal is Open Source software.
+* This means that this software may have been modified pursuant
+* the GNU General Public License, and as distributed it includes
+* or is derivative of works licensed under the GNU General Public License
+* or other free or open source software licenses.
+* See http://www.in-portal.org/license for copyright notices and details.
+*/
 
-	class ChangeLogEventHandler extends kDBEventHandler {
+defined('FULL_PATH') or die('restricted access!');
 
-		/**
-		 * Updates affected record count in session, when change log record is deleted
-		 *
-		 * @param kEvent $event
-		 */
-		function OnAfterItemDelete(&$event)
-		{
-			parent::OnAfterItemDelete($event);
+class ChangeLogEventHandler extends kDBEventHandler {
 
-			$object =& $event->getObject();
-			/* @var $object kDBItem */
+	/**
+	 * Allows to override standard permission mapping
+	 *
+	 */
+	function mapPermissions()
+	{
+		parent::mapPermissions();
 
-			$sql = 'UPDATE ' . $this->Application->getUnitOption('session-log', 'TableName') . '
-					SET AffectedItems = AffectedItems - 1
-					WHERE SessionLogId = ' . $object->GetDBField('SessionLogId');
-			$this->Conn->Query($sql);
-		}
-	}
\ No newline at end of file
+		$permissions = Array (
+			'OnEnableLog' => Array ('self' => 'view'),
+		);
+
+		$this->permMapping = array_merge($this->permMapping, $permissions);
+	}
+
+	/**
+	 * Updates affected record count in session, when change log record is deleted
+	 *
+	 * @param kEvent $event
+	 */
+	function OnAfterItemDelete(&$event)
+	{
+		parent::OnAfterItemDelete($event);
+
+		$object =& $event->getObject();
+		/* @var $object kDBItem */
+
+		$sql = 'UPDATE ' . $this->Application->getUnitOption('session-log', 'TableName') . '
+				SET AffectedItems = AffectedItems - 1
+				WHERE SessionLogId = ' . $object->GetDBField('SessionLogId');
+		$this->Conn->Query($sql);
+	}
+
+	/**
+	 * Changes configuration value to enable log writing
+	 *
+	 * @param kEvent $event
+	 */
+	function OnEnableLog(&$event)
+	{
+		$this->Application->SetConfigValue('UseChangeLog', 1);
+	}
+}
\ No newline at end of file
Index: branches/5.2.x/core/units/logs/change_logs/change_log_tp.php
===================================================================
diff -u -N
--- branches/5.2.x/core/units/logs/change_logs/change_log_tp.php	(revision 0)
+++ branches/5.2.x/core/units/logs/change_logs/change_log_tp.php	(revision 14639)
@@ -0,0 +1,32 @@
+<?php
+/**
+* @version	$Id: change_log_tp.php 14639 2011-10-05 14:17:02Z alex $
+* @package	In-Portal
+* @copyright	Copyright (C) 1997 - 2011 Intechnic. All rights reserved.
+* @license      GNU/GPL
+* In-Portal is Open Source software.
+* This means that this software may have been modified pursuant
+* the GNU General Public License, and as distributed it includes
+* or is derivative of works licensed under the GNU General Public License
+* or other free or open source software licenses.
+* See http://www.in-portal.org/license for copyright notices and details.
+*/
+
+defined('FULL_PATH') or die('restricted access!');
+
+class ChangeLogTagProcessor extends kDBTagProcessor
+{
+	/**
+	 * Displays a message, that allows to enable change log, when it is disabled
+	 *
+	 * @param Array $params
+	 * @return string
+	 * @access protected
+	 */
+	protected function EnableChangeLogMessage($params)
+	{
+		$link_html = $this->Application->ParseBlock( Array ('name' => $params['link_render_as'], 'strip_nl' => 2) );
+
+		return sprintf( $this->Application->Phrase($params['phrase']), $link_html );
+	}
+}
Index: branches/5.2.x/core/admin_templates/logs/change_logs/change_log_list.tpl
===================================================================
diff -u -N -r14244 -r14639
--- branches/5.2.x/core/admin_templates/logs/change_logs/change_log_list.tpl	(.../change_log_list.tpl)	(revision 14244)
+++ branches/5.2.x/core/admin_templates/logs/change_logs/change_log_list.tpl	(.../change_log_list.tpl)	(revision 14639)
@@ -47,6 +47,14 @@
 								);
 
 								a_toolbar.Render();
+
+								<inp2:m_ifnot check="m_GetConfig" var="UseChangeLog">
+									function enable_log() {
+										if ( confirm('<inp2:m_Phrase name="la_msg_EnableTrackingDatabaseChangesToChangeLog" js_escape="1"/>') ) {
+											submit_event('change-log', 'OnEnableLog');
+										}
+									}
+								</inp2:m_ifnot>
 							</script>
 		  				</td>
 
@@ -88,6 +96,17 @@
 	<inp2:Field field="$field" first_chars="$first_chars" nl2br="$nl2br" grid="$grid" no_special="1" format="$format"/>
 </inp2:m_DefineElement>
 
+<inp2:m_DefineElement name="enable_change_log_link">
+	<a href="javascript:enable_log()"><inp2:m_Phrase name="la_config_UseChangeLog"/></a>
+</inp2:m_DefineElement>
+
+<inp2:m_ifnot check="m_GetConfig" var="UseChangeLog">
+	<inp2:m_RenderElement design="form_message">
+		<inp2:change-log_EnableChangeLogMessage phrase="la_msg_ChangeLogIsCurrentlyDisabledTurnOnSettingToEnableIt" link_render_as="enable_change_log_link"/>
+	</inp2:m_RenderElement>
+</inp2:m_ifnot>
+
+
 <inp2:m_RenderElement name="grid" PrefixSpecial="change-log" IdField="ChangeLogId" grid="Default" row_class_render_as="row_class"/>
 <script type="text/javascript">
 	Grids['change-log'].SetDependantToolbarButtons( new Array('edit', 'delete') );
Index: branches/5.2.x/core/install/english.lang
===================================================================
diff -u -N -r14637 -r14639
--- branches/5.2.x/core/install/english.lang	(.../english.lang)	(revision 14637)
+++ branches/5.2.x/core/install/english.lang	(.../english.lang)	(revision 14639)
@@ -694,6 +694,8 @@
 			<PHRASE Label="la_MixedCategoryPath" Module="Core" Type="1">U2VjdGlvbiBwYXRoIGluIG9uZSBmaWVsZA==</PHRASE>
 			<PHRASE Label="la_module_not_licensed" Module="Core" Type="1">TW9kdWxlIG5vdCBsaWNlbnNlZA==</PHRASE>
 			<PHRASE Label="la_monday" Module="Core" Type="1">TW9uZGF5</PHRASE>
+			<PHRASE Label="la_msg_ChangeLogIsCurrentlyDisabledTurnOnSettingToEnableIt" Module="Core" Type="1">Q2hhbmdlIGxvZyBpcyBjdXJyZW50bHkgZGlzYWJsZWQuIFR1cm4gb24gIiVzIiBzZXR0aW5nIHRvIGVuYWJsZSBpdC4=</PHRASE>
+			<PHRASE Label="la_msg_EnableTrackingDatabaseChangesToChangeLog" Module="Core" Type="1">RW5hYmxlIHRyYWNraW5nIGRhdGFiYXNlIGNoYW5nZXMgdG8gY2hhbmdlIGxvZz8=</PHRASE>
 			<PHRASE Label="la_msg_LastOperationHasBeenSuccessfullyCompleted" Module="Core" Type="1">TGFzdCBvcGVyYXRpb24gaGFzIGJlZW4gc3VjY2Vzc2Z1bGx5IGNvbXBsZXRlZCE=</PHRASE>
 			<PHRASE Label="la_Msg_PropagateCategoryStatus" Module="Core" Type="1">QXBwbHkgdG8gYWxsIFN1Yi1zZWN0aW9ucz8=</PHRASE>
 			<PHRASE Label="la_msg_RootPasswordWasReset" Module="Core" Type="1">WW91ciAicm9vdCIgcGFzc3dvcmQgaGFzIGJlZW4gcmVzZXQuIFBsZWFzZSByZW1vdmUgREJHX1JFU0VUX1JPT1QgY29uc3RhbnQgYW5kIGNoZWNrIHlvdXIgZS1tYWlsIGFkZHJlc3Mu</PHRASE>
Index: branches/5.2.x/core/units/logs/change_logs/change_logs_config.php
===================================================================
diff -u -N -r14585 -r14639
--- branches/5.2.x/core/units/logs/change_logs/change_logs_config.php	(.../change_logs_config.php)	(revision 14585)
+++ branches/5.2.x/core/units/logs/change_logs/change_logs_config.php	(.../change_logs_config.php)	(revision 14639)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: change_logs_config.php 14585 2011-09-24 12:04:17Z alex $
+* @version	$Id: change_logs_config.php 14639 2011-10-05 14:17:02Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -19,7 +19,7 @@
 		'ItemClass' => Array('class' => 'kDBItem', 'file' => '', 'build_event' => 'OnItemBuild'),
 		'ListClass' => Array('class' => 'kDBList', 'file' => '', 'build_event' => 'OnListBuild'),
 		'EventHandlerClass' => Array ('class' => 'ChangeLogEventHandler', 'file' => 'change_log_eh.php', 'build_event' => 'OnBuild'),
-		'TagProcessorClass' => Array ('class' => 'kDBTagProcessor', 'file' => '', 'build_event' => 'OnBuild'),
+		'TagProcessorClass' => Array ('class' => 'ChangeLogTagProcessor', 'file' => 'change_log_tp.php', 'build_event' => 'OnBuild'),
 
 		'RegisterClasses' => Array (
 			Array ('pseudo' => 'kChangesFormatter', 'class' => 'kChangesFormatter', 'file' => 'changes_formatter.php', 'build_event' => '', 'require_classes' => 'kFormatter'),