/**
                             * Adds methods promote, remove, and indexOf to Queue instances.
                             *
                             * @module queue-promote
                             * @for Queue
                             */
                            
                            Y.mix(Y.Queue.prototype, {
                                /**
                                 * Returns the current index in the queue of the specified item
                                 *
                                 * @method indexOf
                                 * @param needle {MIXED} the item to search for
                                 * @return {Number} the index of the item or -1 if not found
                                 */
                                indexOf : function (callback) {
                                    return Y.Array.indexOf(this._q, callback);
                                },
                            
                                /**
                                 * Moves the referenced item to the head of the queue
                                 *
                                 * @method promote
                                 * @param item {MIXED} an item in the queue
                                 */
                                promote : function (callback) {
                                    var index = this.indexOf(callback);
                            
                                    if (index > -1) {
                                        this._q.unshift(this._q.splice(index,1)[0]);
                                    }
                                },
                            
                                /**
                                 * Removes the referenced item from the queue
                                 *
                                 * @method remove
                                 * @param item {MIXED} an item in the queue
                                 */
                                remove : function (callback) {
                                    var index = this.indexOf(callback);
                            
                                    if (index > -1) {
                                        this._q.splice(index,1);
                                    }
                                }
                            
                            });