/**
                             * DOM event listener abstraction layer
                             * @module event
                             * @submodule event-base
                             */
                            
                            /**
                             * Executes the callback as soon as the specified element
                             * is detected in the DOM.  This function expects a selector
                             * string for the element(s) to detect.  If you already have
                             * an element reference, you don't need this event.
                             * @event available
                             * @param type {string} 'available'
                             * @param fn {function} the callback function to execute.
                             * @param el {string} an selector for the element(s) to attach
                             * @param context optional argument that specifies what 'this' refers to.
                             * @param args* 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 YUI
                             */
                            Y.Env.evt.plugins.available = {
                                on: function(type, fn, id, o) {
                                    var a = arguments.length > 4 ?  Y.Array(arguments, 4, true) : null;
                                    return Y.Event.onAvailable.call(Y.Event, id, fn, o, a);
                                }
                            };
                            
                            /**
                             * Executes the callback as soon as the specified element
                             * is detected in the DOM with a nextSibling property
                             * (indicating that the element's children are available).
                             * This function expects a selector
                             * string for the element(s) to detect.  If you already have
                             * an element reference, you don't need this event.
                             * @event contentready
                             * @param type {string} 'contentready'
                             * @param fn {function} the callback function to execute.
                             * @param el {string} an selector for the element(s) to attach.
                             * @param context optional argument that specifies what 'this' refers to.
                             * @param args* 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 YUI
                             */
                            Y.Env.evt.plugins.contentready = {
                                on: function(type, fn, id, o) {
                                    var a = arguments.length > 4 ? Y.Array(arguments, 4, true) : null;
                                    return Y.Event.onContentReady.call(Y.Event, id, fn, o, a);
                                }
                            };