add:  if (event.button != 0) return;  
context: function weekViewHourDoubleClick( event ){   var startDate = gCalendarWindow.weekView.getNewEventDate();      newEvent( startDate );}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/7a2f3b007c5630f5d57b5c3cfdde4a652e93339a/calendar.js/clean/calendar/resources/content/calendar.js