rem: obs.onModifyItem (aOldItem, aNewItem); 
add: obs.onModifyItem (aNewItem, aOldItem); 
context:     observeModifyItem: function (aOldItem, aNewItem) {        for each (obs in this.mObservers)            obs.onModifyItem (aOldItem, aNewItem);    },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/a5c97a5023f8c9effbb0a699f500cdd1891a84c7/calStorageCalendar.js/buggy/calendar/providers/storage/calStorageCalendar.js