rem: if (event.eventName && event.eventName != eventName) return false; 
add: if (!Event || !Event.extend || (event.eventName && event.eventName != eventName)) return false; 
context:   function createWrapper(element, eventName, handler) {    var id = getEventID(element);    var c = getWrappersForEventName(id, eventName);    if (c.pluck("handler").include(handler)) return false;        var wrapper = function(event) {      if (event.eventName && event.eventName != eventName)        return false;            Event.extend(event);      handler.call(element, event)    };        wrapper.handler = handler;    c.push(wrapper);    return wrapper;  }
meta: 3332	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/3332/827c8c6b488630d937bfe575db6ff571260fd1c2/event.js/buggy/src/event.js