diff --git a/calendar/inc/class.boalarm.inc.php b/calendar/inc/class.boalarm.inc.php
new file mode 100755
index 0000000000..83528d2e8e
--- /dev/null
+++ b/calendar/inc/class.boalarm.inc.php
@@ -0,0 +1,210 @@
+<?php
+  /**************************************************************************\
+  * eGroupWare - Calendar                                                    *
+  * http://www.egroupware.org                                                *
+  * Based on Webcalendar by Craig Knudsen <cknudsen@radix.net>               *
+  *          http://www.radix.net/~cknudsen                                  *
+  * Modified by Mark Peters <milosch@phpwhere.org>                           *
+  * --------------------------------------------                             *
+  *  This program 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.                                              *
+  \**************************************************************************/
+
+	/* $Id$ */
+
+	define('PHPGW_ACL_DELETEALARM',PHPGW_ACL_DELETE);	// for now
+	define('PHPGW_ACL_SETALARM',PHPGW_ACL_EDIT);
+	define('PHPGW_ACL_READALARM',PHPGW_ACL_READ);
+
+	class boalarm
+	{
+		var $so;
+		var $cal;
+		var $cal_id;
+
+		var $tz_offset;
+
+		var $debug = False;
+//		var $debug = True;
+
+		var $public_functions = array(
+			'add'       => True,
+			'delete'    => True
+		);
+
+		function boalarm()
+		{
+			$cal_id = (isset($_POST['cal_id'])?(int)$_POST['cal_id']:'');
+			if($cal_id)
+			{
+				$this->cal_id = $cal_id;
+			}
+			$this->bo = CreateObject('calendar.bocalendar',1);
+			$this->so = CreateObject('calendar.socalendar',1);
+			$this->tz_offset = $GLOBALS['phpgw']->datetime->tz_offset;
+
+			if($this->debug)
+			{
+				echo "BO Owner : ".$this->bo->owner."<br>\n";
+			}
+
+			if($this->bo->use_session)
+			{
+				$this->save_sessiondata();
+			}
+		}
+
+		function save_sessiondata()
+		{
+			$data = array(
+				'filter' => $this->bo->filter,
+				'cat_id' => $this->bo->cat_id,
+				'owner'  => $this->bo->owner,
+				'year'   => $this->bo->year,
+				'month'  => $this->bo->month,
+				'day'    => $this->bo->day
+			);
+			$this->bo->save_sessiondata($data);
+		}
+
+		function read_entry($cal_id)
+		{
+			return $this->bo->read_entry((int)$cal_id);
+		}
+
+		/*!
+		@function add
+		@abstract adds a new alarm to an event
+		@syntax add(&$event,$time,$login_id)
+		@param &$event event to add the alarm too
+		@param $time for the alarm in sec before the starttime of the event
+		@param $login_id user to alarm
+		@returns the alarm or False
+		*/
+		function add(&$event,$time,$owner)
+		{
+			//echo "<p>boalarm::add(event="; print_r($event); ",time=$time,owner=$owner)</p>\n";
+			if (!$this->check_perms(PHPGW_ACL_SETALARM,$owner) || !($cal_id = $event['id']))
+			{
+				return False;
+			}
+			$alarm = Array(
+				'time'    => ($etime=$this->bo->maketime($event['start'])) - $time,
+				'offset'  => $time,
+				'owner'   => $owner,
+				'enabled' => 1
+			);
+			$alarm['id'] = $this->so->save_alarm($cal_id,$alarm);
+			$event['alarm'][$alarm['id']] = $alarm;
+			$event['alarm'][$alarm['id']]['time'] = $alarm['time'] - $this->tz_offset;	// allows viewing alarm time in users timezone
+
+			return $alarm;
+		}
+
+		/*!
+		@function check_perms
+		@abstract checks if user has a certain grant from the owner of an alarm or event
+		@syntax check_perms($grant,$owner)
+		@param $grant PHPGW_ACL_{SET|READ|DELETE}ALARM (defined at the top of this file)
+		*/
+		function check_perms($grant,$owner)
+		{
+			return $this->bo->check_perms($grant,0,$owner);
+		}
+
+		/*!
+		@function participants
+		@abstract get the participants of an event, the user has grants to alarm
+		@syntax participants($event,$fullnames=True)
+		@param $event or cal_id of an event
+		@param $fullnames if true return array with fullnames as values
+		@returns array with account_ids as keys
+		*/
+		function participants($event,$fullnames=True)
+		{
+			if (!is_array($event))
+			{
+				$event = $this->read_entry($event);
+			}
+			if (!$event)
+			{
+				return False;
+			}
+			$participants = array();
+			foreach ($event['participants'] as $uid => $status)
+			{
+				if ($this->check_perms(PHPGW_ACL_SETALARM,$uid))
+				{
+					$participants[$uid] = $fullnames ? $GLOBALS['phpgw']->common->grab_owner_name($uid) : True;
+				}
+			}
+			return $participants;
+		}
+
+		/*!
+		@function enable
+		@abstract enable or disable one or more alarms identified by its ids
+		@syntax enable($ids,$enable=True)
+		@param $ids array with alarm ids as keys (!)
+		@returns the number of alarms enabled or -1 for insuficent permission to do so
+		@note Not found alarms or insuficent perms stop the enableing of multiple alarms
+		*/
+		function enable($alarms,$enable=True)
+		{
+			$enabled = 0;
+			foreach ($alarms as $id => $field)
+			{
+				if (!($alarm = $this->so->read_alarm($id)))
+				{
+					return 0;	// alarm not found
+				}
+				if (!$alarm['enabled'] == !$enable)
+				{
+					continue;	// nothing to do
+				}
+				if ($enable && !$this->check_perms(PHPGW_ACL_SETALARM,$alarm['owner']) ||
+					!$enable && !$this->check_perms(PHPGW_ACL_DELETEALARM,$alarm['owner']))
+				{
+					return -1;
+				}
+				$alarm['enabled'] = (int)(!$alarm['enabled']);
+				if ($this->so->save_alarm($alarm['cal_id'],$alarm))
+				{
+					++$enabled;
+				}
+			}
+			return $enabled;
+		}
+
+		/*!
+		@function delete
+		@abstract delete one or more alarms identified by its ids
+		@syntax delete($ids)
+		@param $ids array with alarm ids as keys (!)
+		@returns the number of alarms deleted or -1 for insuficent permission to do so
+		@note Not found alarms or insuficent perms stop the deleting of multiple alarms
+		*/
+		function delete($alarms)
+		{
+			$deleted = 0;
+			foreach ($alarms as $id => $field)
+			{
+				if (!($alarm = $this->so->read_alarm($id)))
+				{
+					return 0;	// alarm not found
+				}
+				if (!$this->check_perms(PHPGW_ACL_DELETEALARM,$alarm['owner']))
+				{
+					return -1;
+				}
+				if ($this->so->delete_alarm($id))
+				{
+					++$deleted;
+				}
+			}
+			return $deleted;
+		}
+	}
+?>