Index: t3lib/interfaces/interface.t3lib_pageselect_getpagehook.php
===================================================================
--- t3lib/interfaces/interface.t3lib_pageselect_getpagehook.php	(Revision 0)
+++ t3lib/interfaces/interface.t3lib_pageselect_getpagehook.php	(Revision 0)
@@ -0,0 +1,51 @@
+<?php
+/***************************************************************
+*  Copyright notice
+*
+*  (c) 2009 Christian Kuhn <lolli@schwarzbu.ch>
+*  All rights reserved
+*
+*  This script is part of the TYPO3 project. The TYPO3 project 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 2 of the License, or
+*  (at your option) any later version.
+*
+*  The GNU General Public License can be found at
+*  http://www.gnu.org/copyleft/gpl.html.
+*  A copy is found in the textfile GPL.txt and important notices to the license
+*  from the author is found in LICENSE.txt distributed with these scripts.
+*
+*
+*  This script 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.
+*
+*  This copyright notice MUST APPEAR in all copies of the script!
+***************************************************************/
+
+
+/**
+ * Interface for classes which hook into pageSelect and do additional getPage processing
+ *
+ * @author	Christian Kuhn <lolli@schwarzbu.ch>
+ * @package TYPO3
+ * @subpackage t3lib
+ */
+
+interface t3lib_pageSelect_getPageHook {
+
+	/**
+	 * Modifies the DB params
+	 *
+	 * @param	integer		The page ID
+	 * @param	boolean		If set, the check for group access is disabled. VERY rarely used
+	 * @param	t3lib_pageSelect		parent t3lib_pageSelect object
+	 * @return	void
+	 */
+	public function getPage_preProcess(&$uid, &$disableGroupAccessCheck, t3lib_pageSelect $parentObject);
+
+}
+
+?>
Index: t3lib/class.t3lib_page.php
===================================================================
--- t3lib/class.t3lib_page.php	(Revision 5844)
+++ t3lib/class.t3lib_page.php	(Arbeitskopie)
@@ -188,6 +188,19 @@
 	 * @see getPage_noCheck()
 	 */
 	function getPage($uid, $disableGroupAccessCheck=FALSE)	{
+			// Hook to manipulate the page uid for special overlay handling
+		if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_page.php']['getPage'])) {
+			foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_page.php']['getPage'] as $classRef) {
+				$hookObject = t3lib_div::getUserObj($classRef);
+
+				if (!($hookObject instanceof t3lib_pageSelect_getPageHook)) {
+					throw new UnexpectedValueException('$hookObject must implement interface t3lib_pageSelect_getPageHook', 1251476766);
+				}
+
+				$hookObject->getPage_preProcess($uid, $disableGroupAccessCheck, $this);
+			}
+		}
+
 		$accessCheck = $disableGroupAccessCheck ? '' : $this->where_groupAccess;
 		$cacheKey = md5($accessCheck . '-' . $this->where_hid_del . '-' . $this->sys_language_uid);
 
Index: t3lib/core_autoload.php
===================================================================
--- t3lib/core_autoload.php	(Revision 5844)
+++ t3lib/core_autoload.php	(Arbeitskopie)
@@ -40,6 +40,7 @@
 	't3lib_matchcondition' => PATH_t3lib . 'class.t3lib_matchcondition.php',
 	't3lib_modsettings' => PATH_t3lib . 'class.t3lib_modsettings.php',
 	't3lib_pageselect' => PATH_t3lib . 'class.t3lib_page.php',
+	't3lib_pageselect_getpagehook' => PATH_t3lib . 'interfaces/interface.t3lib_pageselect_getpagehook.php',
 	't3lib_pagetree' => PATH_t3lib . 'class.t3lib_pagetree.php',
 	't3lib_parsehtml' => PATH_t3lib . 'class.t3lib_parsehtml.php',
 	't3lib_parsehtml_proc' => PATH_t3lib . 'class.t3lib_parsehtml_proc.php',