diff -ru 1/typo3/alt_doc.php 2/typo3/alt_doc.php
--- 1/typo3/alt_doc.php	2010-02-18 13:47:06.000000000 +0100
+++ 2/typo3/alt_doc.php	2010-02-18 13:47:06.000000000 +0100
@@ -640,6 +640,13 @@
 
 							// Get the ids:
 						$ids = t3lib_div::trimExplode(',',$cKey,1);
+						
+							//Hook for filtering ids array
+						if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['typo3/alt_doc.php']['filterIDs'])) {
+							foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['typo3/alt_doc.php']['filterIDs'] as $classRef) {
+								$hookObj = t3lib_div::callUserFunction($classRef, $ids, $this);
+							}
+						}
 
 							// Traverse the ids:
 						foreach($ids as $theUid)	{