/**
                             * Functionality to make the node a delegated event container
                             * @module node
                             * @submodule node-event-delegate
                             */
                            
                            /**
                             * <p>Sets up a delegation listener for an event occurring inside the Node.
                             * The delegated event will be verified against a supplied selector or
                             * filtering function to test if the event references at least one node that
                             * should trigger the subscription callback.</p>
                             *
                             * <p>Selector string filters will trigger the callback if the event originated
                             * from a node that matches it or is contained in a node that matches it.
                             * Function filters are called for each Node up the parent axis to the
                             * subscribing container node, and receive at each level the Node and the event
                             * object.  The function should return true (or a truthy value) if that Node
                             * should trigger the subscription callback.  Note, it is possible for filters
                             * to match multiple Nodes for a single event.  In this case, the delegate
                             * callback will be executed for each matching Node.</p>
                             *
                             * <p>For each matching Node, the callback will be executed with its 'this'
                             * object set to the Node matched by the filter (unless a specific context was
                             * provided during subscription), and the provided event's
                             * <code>currentTarget</code> will also be set to the matching Node.  The
                             * containing Node from which the subscription was originally made can be
                             * referenced as <code>e.container</code>.
                             *
                             * @method delegate
                             * @param type {String} the event type to delegate
                             * @param fn {Function} the callback function to execute.  This function
                             *              will be provided the event object for the delegated event.
                             * @param spec {String|Function} a selector that must match the target of the
                             *              event or a function to test target and its parents for a match
                             * @param context {Object} optional argument that specifies what 'this' refers to.
                             * @param args* {any} 0..n additional arguments to pass on to the callback function.
                             *              These arguments will be added after the event object.
                             * @return {EventHandle} the detach handle
                             * @for Node
                             */
                            Y.Node.prototype.delegate = function(type) {
                            
                                var args = Y.Array(arguments, 0, true),
                                    index = (Y.Lang.isObject(type) && !Y.Lang.isArray(type)) ? 1 : 2;
                            
                                args.splice(index, 0, this._node);
                            
                                return Y.delegate.apply(Y, args);
                            };