Index: branches/5.1.x/core/kernel/event_manager.php
===================================================================
diff -u -N -r13086 -r13159
--- branches/5.1.x/core/kernel/event_manager.php	(.../event_manager.php)	(revision 13086)
+++ branches/5.1.x/core/kernel/event_manager.php	(.../event_manager.php)	(revision 13159)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: event_manager.php 13086 2010-01-12 19:47:40Z alex $
+* @version	$Id: event_manager.php 13159 2010-02-24 10:45:00Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -168,7 +168,7 @@
 				unset($this->queryMaps[$prefix]);
 			}
 
-//		'passed' is set later in ProcessRequest - do we really need it here? (it breakes HTTPQuery initialization...)
+//			'passed' is set later in ProcessRequest - do we really need it here? (it breakes HTTPQuery initialization...)
 //			$this->Application->SetVar('passed', implode(',', array_keys($this->queryMaps)) );
 			return $query_map;
 		}
@@ -351,7 +351,11 @@
 					$query_map = array_flip($query_map);
 					if (isset($query_map['event'])) {
 						$event_name = $this->Application->GetVar($prefix_special . '_event');
-						if ($event_name) {
+
+						// we need to check for pre 5.1.0 url format, because of "PerPage"
+						// query string part (that was added in place of "event" query
+						// string part) is available only since 5.1.0 version
+						if ($event_name && !is_numeric($event_name)) {
 							$events[$prefix_special] = $event_name;
 						}
 					}