addEvent: function(type, fn){
                var events = this.retrieve('events', {});
                events[type] = events[type] || {'keys': [], 'values': []};
                if (events[type].keys.contains(fn)) return this;
                events[type].keys.push(fn);
                var realType = type, custom = Element.Events.get(type), condition = fn, self = this;
                if (custom){
                        if (custom.onAdd) custom.onAdd.call(this, fn);
                        if (custom.condition){
                                condition = function(event){
                                        if (custom.condition.call(this, event)) return fn.call(this, event);
                                        return true;
                                };
                        }
                        realType = custom.base || realType;
                }
                var defn = function(){
                        return fn.call(self);
                };
                var nativeEvent = Element.NativeEvents[realType];
                if (nativeEvent){
                        if (nativeEvent == 2){
                                defn = function(event){
                                        event = new Event(event, self.getWindow());
                                        if (condition.call(self, event) === false) event.stop();
                                };
                        }
                        this.addListener(realType, defn);
                }
                events[type].values.push(defn);
                return this;
        },