rem: return null; 
add: return false; 
context: DayView.prototype.getVisibleEvent = function dayview_getVisibleEvent( calendarEvent ){   eventBox = document.getElementById( "day-view-event-box-"+calendarEvent.id );   if ( eventBox )    {      return eventBox;   }   else      return null;}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/0d6de38d8eaa2f31d49caff2cce9b47151bf6f4e/dayView.js/buggy/calendar/resources/content/dayView.js