add: } 
context:     addObserver: function (aObserver, aItemFilter) {        for each (obs in this.mObservers) {            if (obs == aObserver)                return;        }        this.mObservers.push(aObserver);    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/280f5745e11c456b8a13d45f281bf24fae621bd0/calDavCalendar.js/buggy/calendar/providers/caldav/calDavCalendar.js