# Yahoo! UI Library

### Button 2.5.0

Yahoo! UI Library > button > button.js (source view)

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    /**
    * @module button
    * @description <p>The Button Control enables the creation of rich, graphical
    * buttons that function like traditional HTML form buttons.  <em>Unlike</em>
    * tradition HTML form buttons, buttons created with the Button Control can have
    * a label that is different from its value.  With the inclusion of the optional
    * <a href="module_menu.html">Menu Control</a>, the Button Control can also be
    * used to create menu buttons and split buttons, controls that are not
    * available natively in HTML.  The Button Control can also be thought of as a
    * way to create more visually engaging implementations of the browser's
    * default radio-button and check-box controls.</p>
    * <p>The Button Control supports the following types:</p>
    * <dl>
    * <dt>push</dt>
    * <dd>Basic push button that can execute a user-specified command when
    * pressed.</dd>
    * <dt>link</dt>
    * <dd>Navigates to a specified url when pressed.</dd>
    * <dt>submit</dt>
    * <dd>Submits the parent form when pressed.</dd>
    * <dt>reset</dt>
    * <dd>Resets the parent form when pressed.</dd>
    * <dt>checkbox</dt>
    * <dd>Maintains a "checked" state that can be toggled on and off.</dd>
    * <dt>radio</dt>
    * <dd>Maintains a "checked" state that can be toggled on and off.  Use with
    * the ButtonGroup class to create a set of controls that are mutually
    * exclusive; checking one button in the set will uncheck all others in
    * the group.</dd>
    * <dt>menu</dt>
    * <dd>When pressed will show/hide a menu.</dd>
    * <dt>split</dt>
    * <dd>Can execute a user-specified command or display a menu when pressed.</dd>
    * </dl>
    * @title Button
    * @namespace YAHOO.widget
    * @requires yahoo, dom, element, event
    * @optional container, menu
    */

    (function () {

        /**
        * The Button class creates a rich, graphical button.
        * @param {String} p_oElement String specifying the id attribute of the
        * <code>&#60;input&#62;</code>, <code>&#60;button&#62;</code>,
        * <code>&#60;a&#62;</code>, or <code>&#60;span&#62;</code> element to
        * be used to create the button.
        * @param {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-
        * one-html.html#ID-6043025">HTMLInputElement</a>|<a href="http://www.w3.org
        * /TR/2000/WD-DOM-Level-1-20000929/level-one-html.html#ID-34812697">
        * HTMLButtonElement</a>|<a href="
        * http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-html.html#
        * ID-33759296">HTMLElement</a>} p_oElement Object reference for the
        * <code>&#60;input&#62;</code>, <code>&#60;button&#62;</code>,
        * <code>&#60;a&#62;</code>, or <code>&#60;span&#62;</code> element to be
        * used to create the button.
        * @param {Object} p_oElement Object literal specifying a set of
        * configuration attributes used to create the button.
        * @param {Object} p_oAttributes Optional. Object literal specifying a set
        * of configuration attributes used to create the button.
        * @namespace YAHOO.widget
        * @class Button
        * @constructor
        * @extends YAHOO.util.Element
        */

        // Shorthard for utilities

        var Dom = YAHOO.util.Dom,
            Event = YAHOO.util.Event,
            Lang = YAHOO.lang,
            Overlay = YAHOO.widget.Overlay,
            Menu = YAHOO.widget.Menu,

            // Private member variables

            m_oButtons = {},    // Collection of all Button instances
            m_oOverlayManager = null,   // YAHOO.widget.OverlayManager instance
            m_oSubmitTrigger = null,    // The button that submitted the form
            m_oFocusedButton = null;    // The button that has focus

        // Private methods

        /**
        * @method createInputElement
        * @description Creates an <code>&#60;input&#62;</code> element of the
        * specified type.
        * @private
        * @param {String} p_sType String specifying the type of
        * <code>&#60;input&#62;</code> element to create.
        * @param {String} p_sName String specifying the name of
        * <code>&#60;input&#62;</code> element to create.
        * @param {String} p_sValue String specifying the value of
        * <code>&#60;input&#62;</code> element to create.
        * @param {String} p_bChecked Boolean specifying if the
        * <code>&#60;input&#62;</code> element is to be checked.
        * @return {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-
        * one-html.html#ID-6043025">HTMLInputElement</a>}
        */
        function createInputElement(p_sType, p_sName, p_sValue, p_bChecked) {

            var oInput,
                sInput;

            if (Lang.isString(p_sType) && Lang.isString(p_sName)) {

                if (YAHOO.env.ua.ie) {

                    /*
                        For IE it is necessary to create the element with the
                        "type," "name," "value," and "checked" properties set all
                        at once.
                    */

                    sInput = "<input type=\"" + p_sType + "\" name=\"" +
                        p_sName + "\"";

                    if (p_bChecked) {

                        sInput += " checked";

                    }

                    sInput += ">";

                    oInput = document.createElement(sInput);

                }
                else {

                    oInput = document.createElement("input");
                    oInput.name = p_sName;
                    oInput.type = p_sType;

                    if (p_bChecked) {

                        oInput.checked = true;

                    }

                }

                oInput.value = p_sValue;

                return oInput;

            }

        }

        /**
        * @method setAttributesFromSrcElement
        * @description Gets the values for all the attributes of the source element
        * (either <code>&#60;input&#62;</code> or <code>&#60;a&#62;</code>) that
        * map to Button configuration attributes and sets them into a collection
        * that is passed to the Button constructor.
        * @private
        * @param {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-
        * one-html.html#ID-6043025">HTMLInputElement</a>|<a href="http://www.w3.org/
        * TR/2000/WD-DOM-Level-1-20000929/level-one-html.html#ID-
        * 48250443">HTMLAnchorElement</a>} p_oElement Object reference to the HTML
        * element (either <code>&#60;input&#62;</code> or <code>&#60;span&#62;
        * </code>) used to create the button.
        * @param {Object} p_oAttributes Object reference for the collection of
        * configuration attributes used to create the button.
        */
        function setAttributesFromSrcElement(p_oElement, p_oAttributes) {

            var sSrcElementNodeName = p_oElement.nodeName.toUpperCase(),
                me = this,
                oAttribute,
                oRootNode,
                sText;

            /**
            * @method setAttributeFromDOMAttribute
            * @description Gets the value of the specified DOM attribute and sets it
            * into the collection of configuration attributes used to configure
            * the button.
            * @private
            * @param {String} p_sAttribute String representing the name of the
            * attribute to retrieve from the DOM element.
            */
            function setAttributeFromDOMAttribute(p_sAttribute) {

                if (!(p_sAttribute in p_oAttributes)) {

                    /*
                        Need to use "getAttributeNode" instead of "getAttribute"
                        because using "getAttribute," IE will return the innerText
                        of a <code>&#60;button&#62;</code> for the value attribute
                        rather than the value of the "value" attribute.
                    */

                    oAttribute = p_oElement.getAttributeNode(p_sAttribute);

                    if (oAttribute && ("value" in oAttribute)) {

                        me.logger.log("Setting attribute \"" + p_sAttribute +
                            "\" using source element's attribute value of \"" +
                            oAttribute.value + "\"");

                        p_oAttributes[p_sAttribute] = oAttribute.value;

                    }

                }

            }

            /**
            * @method setFormElementProperties
            * @description Gets the value of the attributes from the form element
            * and sets them into the collection of configuration attributes used to
            * configure the button.
            * @private
            */
            function setFormElementProperties() {

                setAttributeFromDOMAttribute("type");

                if (p_oAttributes.type == "button") {

                    p_oAttributes.type = "push";

                }

                if (!("disabled" in p_oAttributes)) {

                    p_oAttributes.disabled = p_oElement.disabled;

                }

                setAttributeFromDOMAttribute("name");
                setAttributeFromDOMAttribute("value");
                setAttributeFromDOMAttribute("title");

            }

            switch (sSrcElementNodeName) {

            case "A":

                p_oAttributes.type = "link";

                setAttributeFromDOMAttribute("href");
                setAttributeFromDOMAttribute("target");

                break;

            case "INPUT":

                setFormElementProperties();

                if (!("checked" in p_oAttributes)) {

                    p_oAttributes.checked = p_oElement.checked;

                }

                break;

            case "BUTTON":

                setFormElementProperties();

                oRootNode = p_oElement.parentNode.parentNode;

                if (Dom.hasClass(oRootNode, this.CSS_CLASS_NAME + "-checked")) {

                    p_oAttributes.checked = true;

                }

                if (Dom.hasClass(oRootNode, this.CSS_CLASS_NAME + "-disabled")) {

                    p_oAttributes.disabled = true;

                }

                p_oElement.removeAttribute("value");

                p_oElement.setAttribute("type", "button");

                break;

            }

            p_oElement.removeAttribute("id");
            p_oElement.removeAttribute("name");

            if (!("tabindex" in p_oAttributes)) {

                p_oAttributes.tabindex = p_oElement.tabIndex;

            }

            if (!("label" in p_oAttributes)) {

                // Set the "label" property

                sText = sSrcElementNodeName == "INPUT" ?
                                p_oElement.value : p_oElement.innerHTML;

                if (sText && sText.length > 0) {

                    p_oAttributes.label = sText;

                }

            }

        }

        /**
        * @method initConfig
        * @description Initializes the set of configuration attributes that are
        * used to instantiate the button.
        * @private
        * @param {Object} Object representing the button's set of
        * configuration attributes.
        */
        function initConfig(p_oConfig) {

            var oAttributes = p_oConfig.attributes,
                oSrcElement = oAttributes.srcelement,
                sSrcElementNodeName = oSrcElement.nodeName.toUpperCase(),
                me = this;

            if (sSrcElementNodeName == this.NODE_NAME) {

                p_oConfig.element = oSrcElement;
                p_oConfig.id = oSrcElement.id;

                Dom.getElementsBy(function (p_oElement) {

                    switch (p_oElement.nodeName.toUpperCase()) {

                    case "BUTTON":
                    case "A":
                    case "INPUT":

                        setAttributesFromSrcElement.call(me, p_oElement,
                            oAttributes);

                        break;

                    }

                }, "*", oSrcElement);

            }
            else {

                switch (sSrcElementNodeName) {

                case "BUTTON":
                case "A":
                case "INPUT":

                    setAttributesFromSrcElement.call(this, oSrcElement,
                        oAttributes);

                    break;

                }

            }

        }

        //  Constructor

        YAHOO.widget.Button = function (p_oElement, p_oAttributes) {

    		if (!Overlay && YAHOO.widget.Overlay) {

    			Overlay = YAHOO.widget.Overlay;

    		}

    		if (!Menu && YAHOO.widget.Menu) {

    			Menu = YAHOO.widget.Menu;

    		}

            var fnSuperClass = YAHOO.widget.Button.superclass.constructor,
                oConfig,
                oElement;

            if (arguments.length == 1 && !Lang.isString(p_oElement) &&
                !p_oElement.nodeName) {

                if (!p_oElement.id) {

                    p_oElement.id = Dom.generateId();

                    YAHOO.log("No value specified for the button's \"id\" " +
                        "attribute. Setting button id to \"" + p_oElement.id +
                        "\".", "warn");

                }

                this.logger = new YAHOO.widget.LogWriter("Button " + p_oElement.id);

                this.logger.log("No source HTML element.  Building the button " +
                        "using the set of configuration attributes.");

                fnSuperClass.call(this,
                    (this.createButtonElement(p_oElement.type)),
                    p_oElement);

            }
            else {

                oConfig = { element: null, attributes: (p_oAttributes || {}) };

                if (Lang.isString(p_oElement)) {

                    oElement = Dom.get(p_oElement);

                    if (oElement) {

                        if (!oConfig.attributes.id) {

                            oConfig.attributes.id = p_oElement;

                        }

                        this.logger = new YAHOO.widget.LogWriter(
                                            "Button " + oConfig.attributes.id);

                        this.logger.log("Building the button using an existing " +
                                "HTML element as a source element.");

                        oConfig.attributes.srcelement = oElement;

                        initConfig.call(this, oConfig);

                        if (!oConfig.element) {

                            this.logger.log("Source element could not be used " +
                                    "as is.  Creating a new HTML element for " +
                                    "the button.");

                            oConfig.element =
                                this.createButtonElement(oConfig.attributes.type);

                        }

                        fnSuperClass.call(this, oConfig.element,
                            oConfig.attributes);

                    }

                }
                else if (p_oElement.nodeName) {

                    if (!oConfig.attributes.id) {

                        if (p_oElement.id) {

                            oConfig.attributes.id = p_oElement.id;

                        }
                        else {

                            oConfig.attributes.id = Dom.generateId();

                            YAHOO.log("No value specified for the button's " +
                                "\"id\" attribute. Setting button id to \"" +
                                oConfig.attributes.id + "\".", "warn");

                        }

                    }

                    this.logger = new YAHOO.widget.LogWriter(
                        "Button " + oConfig.attributes.id);

                    this.logger.log("Building the button using an existing HTML " +
                        "element as a source element.");

                    oConfig.attributes.srcelement = p_oElement;

                    initConfig.call(this, oConfig);

                    if (!oConfig.element) {

                        this.logger.log("Source element could not be used as is." +
                                "  Creating a new HTML element for the button.");

                        oConfig.element =
                            this.createButtonElement(oConfig.attributes.type);

                    }

                    fnSuperClass.call(this, oConfig.element, oConfig.attributes);

                }

            }

        };

        YAHOO.extend(YAHOO.widget.Button, YAHOO.util.Element, {

            // Protected properties

            /**
            * @property _button
            * @description Object reference to the button's internal
            * <code>&#60;a&#62;</code> or <code>&#60;button&#62;</code> element.
            * @default null
            * @protected
            * @type <a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
            * level-one-html.html#ID-48250443">HTMLAnchorElement</a>|<a href="
            * http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-html.html
            * #ID-34812697">HTMLButtonElement</a>
            */
            _button: null,

            /**
            * @property _menu
            * @description Object reference to the button's menu.
            * @default null
            * @protected
            * @type {<a href="YAHOO.widget.Overlay.html">YAHOO.widget.Overlay</a>|
            * <a href="YAHOO.widget.Menu.html">YAHOO.widget.Menu</a>}
            */
            _menu: null,

            /**
            * @property _hiddenFields
            * @description Object reference to the <code>&#60;input&#62;</code>
            * element, or array of HTML form elements used to represent the button
            *  when its parent form is submitted.
            * @default null
            * @protected
            * @type <a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
            * level-one-html.html#ID-6043025">HTMLInputElement</a>|Array
            */
            _hiddenFields: null,

            /**
            * @property _onclickAttributeValue
            * @description Object reference to the button's current value for the
            * "onclick" configuration attribute.
            * @default null
            * @protected
            * @type Object
            */
            _onclickAttributeValue: null,

            /**
            * @property _activationKeyPressed
            * @description Boolean indicating if the key(s) that toggle the button's
            * "active" state have been pressed.
            * @default false
            * @protected
            * @type Boolean
            */
            _activationKeyPressed: false,

            /**
            * @property _activationButtonPressed
            * @description Boolean indicating if the mouse button that toggles
            * the button's "active" state has been pressed.
            * @default false
            * @protected
            * @type Boolean
            */
            _activationButtonPressed: false,

            /**
            * @property _hasKeyEventHandlers
            * @description Boolean indicating if the button's "blur", "keydown" and
            * "keyup" event handlers are assigned
            * @default false
            * @protected
            * @type Boolean
            */
            _hasKeyEventHandlers: false,

            /**
            * @property _hasMouseEventHandlers
            * @description Boolean indicating if the button's "mouseout,"
            * "mousedown," and "mouseup" event handlers are assigned
            * @default false
            * @protected
            * @type Boolean
            */
            _hasMouseEventHandlers: false,

            // Constants

            /**
            * @property NODE_NAME
            * @description The name of the node to be used for the button's
            * root element.
            * @default "SPAN"
            * @final
            * @type String
            */
            NODE_NAME: "SPAN",

            /**
            * @property CHECK_ACTIVATION_KEYS
            * @description Array of numbers representing keys that (when pressed)
            * toggle the button's "checked" attribute.
            * @default [32]
            * @final
            * @type Array
            */
            CHECK_ACTIVATION_KEYS: [32],

            /**
            * @property ACTIVATION_KEYS
            * @description Array of numbers representing keys that (when presed)
            * toggle the button's "active" state.
            * @default [13, 32]
            * @final
            * @type Array
            */
            ACTIVATION_KEYS: [13, 32],

            /**
            * @property OPTION_AREA_WIDTH
            * @description Width (in pixels) of the area of a split button that
            * when pressed will display a menu.
            * @default 20
            * @final
            * @type Number
            */
            OPTION_AREA_WIDTH: 20,

            /**
            * @property CSS_CLASS_NAME
            * @description String representing the CSS class(es) to be applied to
            * the button's root element.
            * @default "yui-button"
            * @final
            * @type String
            */
            CSS_CLASS_NAME: "yui-button",

            /**
            * @property RADIO_DEFAULT_TITLE
            * @description String representing the default title applied to buttons
            * of type "radio."
            * @default "Unchecked.  Click to check."
            * @final
            * @type String
            */
            RADIO_DEFAULT_TITLE: "Unchecked.  Click to check.",

            /**
            * @property RADIO_CHECKED_TITLE
            * @description String representing the title applied to buttons of
            * type "radio" when checked.
            * @default "Checked.  Click another button to uncheck"
            * @final
            * @type String
            */
            RADIO_CHECKED_TITLE: "Checked.  Click another button to uncheck",

            /**
            * @property CHECKBOX_DEFAULT_TITLE
            * @description String representing the default title applied to
            * buttons of type "checkbox."
            * @default "Unchecked.  Click to check."
            * @final
            * @type String
            */
            CHECKBOX_DEFAULT_TITLE: "Unchecked.  Click to check.",

            /**
            * @property CHECKBOX_CHECKED_TITLE
            * @description String representing the title applied to buttons of type
            * "checkbox" when checked.
            * @default "Checked.  Click to uncheck."
            * @final
            * @type String
            */
            CHECKBOX_CHECKED_TITLE: "Checked.  Click to uncheck.",

            /**
            * @property MENUBUTTON_DEFAULT_TITLE
            * @description String representing the default title applied to
            * buttons of type "menu."
            * @default "Menu collapsed.  Click to expand."
            * @final
            * @type String
            */
            MENUBUTTON_DEFAULT_TITLE: "Menu collapsed.  Click to expand.",

            /**
            * @property MENUBUTTON_MENU_VISIBLE_TITLE
            * @description String representing the title applied to buttons of type
            * "menu" when the button's menu is visible.
            * @default "Menu expanded.  Click or press Esc to collapse."
            * @final
            * @type String
            */
            MENUBUTTON_MENU_VISIBLE_TITLE:
                "Menu expanded.  Click or press Esc to collapse.",

            /**
            * @property SPLITBUTTON_DEFAULT_TITLE
            * @description  String representing the default title applied to
            * buttons of type "split."
            * @default "Menu collapsed.  Click inside option region or press
            * Ctrl + Shift + M to show the menu."
            * @final
            * @type String
            */
            SPLITBUTTON_DEFAULT_TITLE: ("Menu collapsed.  Click inside option " +
                "region or press Ctrl + Shift + M to show the menu."),

            /**
            * @property SPLITBUTTON_OPTION_VISIBLE_TITLE
            * @description String representing the title applied to buttons of type
            * "split" when the button's menu is visible.
            * @default "Menu expanded.  Press Esc or Ctrl + Shift + M to hide
            * the menu."
            * @final
            * @type String
            */
            SPLITBUTTON_OPTION_VISIBLE_TITLE:
                "Menu expanded.  Press Esc or Ctrl + Shift + M to hide the menu.",

            /**
            * @property SUBMIT_TITLE
            * @description String representing the title applied to buttons of
            * type "submit."
            * @default "Click to submit form."
            * @final
            * @type String
            */
            SUBMIT_TITLE: "Click to submit form.",

            // Protected attribute setter methods

            /**
            * @method _setType
            * @description Sets the value of the button's "type" attribute.
            * @protected
            * @param {String} p_sType String indicating the value for the button's
            * "type" attribute.
            */
            _setType: function (p_sType) {

                if (p_sType == "split") {

                    this.on("option", this._onOption);

                }

            },

            /**
            * @method _setLabel
            * @description Sets the value of the button's "label" attribute.
            * @protected
            * @param {String} p_sLabel String indicating the value for the button's
            * "label" attribute.
            */
            _setLabel: function (p_sLabel) {

                this._button.innerHTML = p_sLabel;

                /*
                    Remove and add the default class name from the root element
                    for Gecko to ensure that the button shrinkwraps to the label.
                    Without this the button will not be rendered at the correct
                    width when the label changes.  The most likely cause for this
                    bug is button's use of the Gecko-specific CSS display type of
                    "-moz-inline-box" to simulate "inline-block" supported by IE,
                    Safari and Opera.
                */

                var sClass,
                    me;

                if (YAHOO.env.ua.gecko && Dom.inDocument(this.get("element"))) {

                    me = this;
                    sClass = this.CSS_CLASS_NAME;

                    this.removeClass(sClass);

                    window.setTimeout(function () {

                        me.addClass(sClass);

                    }, 0);

                }

            },

            /**
            * @method _setTabIndex
            * @description Sets the value of the button's "tabindex" attribute.
            * @protected
            * @param {Number} p_nTabIndex Number indicating the value for the
            * button's "tabindex" attribute.
            */
            _setTabIndex: function (p_nTabIndex) {

                this._button.tabIndex = p_nTabIndex;

            },

            /**
            * @method _setTitle
            * @description Sets the value of the button's "title" attribute.
            * @protected
            * @param {String} p_nTabIndex Number indicating the value for
            * the button's "title" attribute.
            */
            _setTitle: function (p_sTitle) {

                var sTitle = p_sTitle;

                if (this.get("type") != "link") {

                    if (!sTitle) {

                        switch (this.get("type")) {

                        case "radio":

                            sTitle = this.RADIO_DEFAULT_TITLE;

                            break;

                        case "checkbox":

                            sTitle = this.CHECKBOX_DEFAULT_TITLE;

                            break;

                        case "menu":

                            sTitle = this.MENUBUTTON_DEFAULT_TITLE;

                            break;

                        case "split":

                            sTitle = this.SPLITBUTTON_DEFAULT_TITLE;

                            break;

                        case "submit":

                            sTitle = this.SUBMIT_TITLE;

                            break;

                        }

                    }

                    this._button.title = sTitle;

                }

            },

            /**
            * @method _setDisabled
            * @description Sets the value of the button's "disabled" attribute.
            * @protected
            * @param {Boolean} p_bDisabled Boolean indicating the value for
            * the button's "disabled" attribute.
            */
            _setDisabled: function (p_bDisabled) {

                if (this.get("type") != "link") {

                    if (p_bDisabled) {

                        if (this._menu) {

                            this._menu.hide();

                        }

                        if (this.hasFocus()) {

                            this.blur();

                        }

                        this._button.setAttribute("disabled", "disabled");

                        this.addStateCSSClasses("disabled");

                        this.removeStateCSSClasses("hover");
                        this.removeStateCSSClasses("active");
                        this.removeStateCSSClasses("focus");

                    }
                    else {

                        this._button.removeAttribute("disabled");

                        this.removeStateCSSClasses("disabled");

                    }

                }

            },

            /**
            * @method _setHref
            * @description Sets the value of the button's "href" attribute.
            * @protected
            * @param {String} p_sHref String indicating the value for the button's
            * "href" attribute.
            */
            _setHref: function (p_sHref) {

                if (this.get("type") == "link") {

                    this._button.href = p_sHref;

                }

            },

            /**
            * @method _setTarget
            * @description Sets the value of the button's "target" attribute.
            * @protected
            * @param {String} p_sTarget String indicating the value for the button's
            * "target" attribute.
            */
            _setTarget: function (p_sTarget) {

                if (this.get("type") == "link") {

                    this._button.setAttribute("target", p_sTarget);

                }

            },

            /**
            * @method _setChecked
            * @description Sets the value of the button's "target" attribute.
            * @protected
            * @param {Boolean} p_bChecked Boolean indicating the value for
            * the button's "checked" attribute.
            */
            _setChecked: function (p_bChecked) {

                var sType = this.get("type"),
                    sTitle;

                if (sType == "checkbox" || sType == "radio") {

                    if (p_bChecked) {

                        this.addStateCSSClasses("checked");

                        sTitle = (sType == "radio") ?
                                    this.RADIO_CHECKED_TITLE :
                                    this.CHECKBOX_CHECKED_TITLE;

                    }
                    else {

                        this.removeStateCSSClasses("checked");

                        sTitle = (sType == "radio") ?
                                    this.RADIO_DEFAULT_TITLE :
                                    this.CHECKBOX_DEFAULT_TITLE;

                    }

                    this.set("title", sTitle);

                }

            },

            /**
            * @method _setMenu
            * @description Sets the value of the button's "menu" attribute.
            * @protected
            * @param {Object} p_oMenu Object indicating the value for the button's
            * "menu" attribute.
            */
            _setMenu: function (p_oMenu) {

                var bLazyLoad = this.get("lazyloadmenu"),
                    oButtonElement = this.get("element"),
                    sMenuCSSClassName,

                    /*
                        Boolean indicating if the value of p_oMenu is an instance
                        of YAHOO.widget.Menu or YAHOO.widget.Overlay.
                    */

                    bInstance = false,

                    oMenu,
                    oMenuElement,
                    oSrcElement,
                    aItems,
                    nItems,
                    oItem,
                    i;

                if (!Overlay) {

                    this.logger.log("YAHOO.widget.Overlay dependency not met.",
                        "error");

                    return false;

                }

                if (Menu) {

                    sMenuCSSClassName = Menu.prototype.CSS_CLASS_NAME;

                }

                function onAppendTo() {

                    oMenu.render(oButtonElement.parentNode);

                    this.removeListener("appendTo", onAppendTo);

                }

                function initMenu() {

                    if (oMenu) {

                        Dom.addClass(oMenu.element, this.get("menuclassname"));
                        Dom.addClass(oMenu.element,
                                "yui-" + this.get("type") + "-button-menu");

                        oMenu.showEvent.subscribe(this._onMenuShow, null, this);
                        oMenu.hideEvent.subscribe(this._onMenuHide, null, this);
                        oMenu.renderEvent.subscribe(this._onMenuRender, null, this);

                        if (Menu && oMenu instanceof Menu) {

                            oMenu.keyDownEvent.subscribe(this._onMenuKeyDown,
                                this, true);

                            oMenu.subscribe("click", this._onMenuClick,
                                this, true);

                            oMenu.itemAddedEvent.subscribe(this._onMenuItemAdded,
                                this, true);

                            oSrcElement = oMenu.srcElement;

                            if (oSrcElement &&
                                oSrcElement.nodeName.toUpperCase() == "SELECT") {

                                oSrcElement.style.display = "none";
                                oSrcElement.parentNode.removeChild(oSrcElement);

                            }

                        }
                        else if (Overlay && oMenu instanceof Overlay) {

                            if (!m_oOverlayManager) {

                                m_oOverlayManager =
                                    new YAHOO.widget.OverlayManager();

                            }

                            m_oOverlayManager.register(oMenu);

                        }

                        this._menu = oMenu;

                        if (!bInstance) {

                            if (bLazyLoad && Menu && !(oMenu instanceof Menu)) {

                                /*
                                    Mimic Menu's "lazyload" functionality by adding
                                    a "beforeshow" event listener that renders the
                                    Overlay instance before it is made visible by
                                    the button.
                                */

                                oMenu.beforeShowEvent.subscribe(
                                    this._onOverlayBeforeShow, null, this);

                            }
                            else if (!bLazyLoad) {

                                if (Dom.inDocument(oButtonElement)) {

                                    oMenu.render(oButtonElement.parentNode);

                                }
                                else {

                                    this.on("appendTo", onAppendTo);

                                }

                            }

                        }

                    }

                }

                if (p_oMenu && Menu && (p_oMenu instanceof Menu)) {

                    oMenu = p_oMenu;
                    aItems = oMenu.getItems();
                    nItems = aItems.length;
                    bInstance = true;

                    if (nItems > 0) {

                        i = nItems - 1;

                        do {

                            oItem = aItems[i];

                            if (oItem) {

                                oItem.cfg.subscribeToConfigEvent("selected",
                                    this._onMenuItemSelected,
                                    oItem,
                                    this);

                            }

                        }
                        while (i--);

                    }

                    initMenu.call(this);

                }
                else if (Overlay && p_oMenu && (p_oMenu instanceof Overlay)) {

                    oMenu = p_oMenu;
                    bInstance = true;

                    oMenu.cfg.setProperty("visible", false);
                    oMenu.cfg.setProperty("context", [oButtonElement, "tl", "bl"]);

                    initMenu.call(this);

                }
                else if (Menu && Lang.isArray(p_oMenu)) {

                    this.on("appendTo", function () {

                        oMenu = new Menu(Dom.generateId(), { lazyload: bLazyLoad,
                            itemdata: p_oMenu });

                        initMenu.call(this);

                    });

                }
                else if (Lang.isString(p_oMenu)) {

                    oMenuElement = Dom.get(p_oMenu);

                    if (oMenuElement) {

                        if (Menu && Dom.hasClass(oMenuElement, sMenuCSSClassName) ||
                            oMenuElement.nodeName.toUpperCase() == "SELECT") {

                            oMenu = new Menu(p_oMenu, { lazyload: bLazyLoad });

                            initMenu.call(this);

                        }
                        else if (Overlay) {

                            oMenu = new Overlay(p_oMenu, { visible: false,
                                context: [oButtonElement, "tl", "bl"] });

                            initMenu.call(this);

                        }

                    }

                }
                else if (p_oMenu && p_oMenu.nodeName) {

                    if (Menu && Dom.hasClass(p_oMenu, sMenuCSSClassName) ||
                            p_oMenu.nodeName.toUpperCase() == "SELECT") {

                        oMenu = new Menu(p_oMenu, { lazyload: bLazyLoad });

                        initMenu.call(this);

                    }
                    else if (Overlay) {

                        if (!p_oMenu.id) {

                            Dom.generateId(p_oMenu);

                        }

                        oMenu = new Overlay(p_oMenu, { visible: false,
                                        context: [oButtonElement, "tl", "bl"] });

                        initMenu.call(this);

                    }

                }

            },

            /**
            * @method _setOnClick
            * @description Sets the value of the button's "onclick" attribute.
            * @protected
            * @param {Object} p_oObject Object indicating the value for the button's
            * "onclick" attribute.
            */
            _setOnClick: function (p_oObject) {

                /*
                    Remove any existing listeners if a "click" event handler
                    has already been specified.
                */

                if (this._onclickAttributeValue &&
                    (this._onclickAttributeValue != p_oObject)) {

                    this.removeListener("click", this._onclickAttributeValue.fn);

                    this._onclickAttributeValue = null;

                }

                if (!this._onclickAttributeValue &&
                    Lang.isObject(p_oObject) &&
                    Lang.isFunction(p_oObject.fn)) {

                    this.on("click", p_oObject.fn, p_oObject.obj, p_oObject.scope);

                    this._onclickAttributeValue = p_oObject;

                }

            },

            /**
            * @method _setSelectedMenuItem
            * @description Sets the value of the button's
            * "selectedMenuItem" attribute.
            * @protected
            * @param {Number} p_nIndex Number representing the index of the item
            * in the button's menu that is currently selected.
            */
            _setSelectedMenuItem: function (p_nIndex) {

                var oMenu = this._menu,
                    oMenuItem;

                if (Menu && oMenu && oMenu instanceof Menu) {

                    oMenuItem = oMenu.getItem(p_nIndex);

                    if (oMenuItem && !oMenuItem.cfg.getProperty("selected")) {

                        oMenuItem.cfg.setProperty("selected", true);

                    }

                }

            },

            // Protected methods

            /**
            * @method _isActivationKey
            * @description Determines if the specified keycode is one that toggles
            * the button's "active" state.
            * @protected
            * @param {Number} p_nKeyCode Number representing the keycode to
            * be evaluated.
            * @return {Boolean}
            */
            _isActivationKey: function (p_nKeyCode) {

                var sType = this.get("type"),
                    aKeyCodes = (sType == "checkbox" || sType == "radio") ?
                        this.CHECK_ACTIVATION_KEYS : this.ACTIVATION_KEYS,

                    nKeyCodes = aKeyCodes.length,
                    i;

                if (nKeyCodes > 0) {

                    i = nKeyCodes - 1;

                    do {

                        if (p_nKeyCode == aKeyCodes[i]) {

                            return true;

                        }

                    }
                    while (i--);

                }

            },

            /**
            * @method _isSplitButtonOptionKey
            * @description Determines if the specified keycode is one that toggles
            * the display of the split button's menu.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            * @return {Boolean}
            */
            _isSplitButtonOptionKey: function (p_oEvent) {

                return (p_oEvent.ctrlKey && p_oEvent.shiftKey &&
                    Event.getCharCode(p_oEvent) == 77);

            },

            /**
            * @method _addListenersToForm
            * @description Adds event handlers to the button's form.
            * @protected
            */
            _addListenersToForm: function () {

                var oForm = this.getForm(),
                    onFormKeyPress = YAHOO.widget.Button.onFormKeyPress,
                    bHasKeyPressListener,
                    oSrcElement,
                    aListeners,
                    nListeners,
                    i;

                if (oForm) {

                    Event.on(oForm, "reset", this._onFormReset, null, this);
                    Event.on(oForm, "submit", this.createHiddenFields, null, this);

                    oSrcElement = this.get("srcelement");

                    if (this.get("type") == "submit" ||
                        (oSrcElement && oSrcElement.type == "submit"))
                    {

                        aListeners = Event.getListeners(oForm, "keypress");
                        bHasKeyPressListener = false;

                        if (aListeners) {

                            nListeners = aListeners.length;

                            if (nListeners > 0) {

                                i = nListeners - 1;

                                do {

                                    if (aListeners[i].fn == onFormKeyPress) {

                                        bHasKeyPressListener = true;
                                        break;

                                    }

                                }
                                while (i--);

                            }

                        }

                        if (!bHasKeyPressListener) {

                            Event.on(oForm, "keypress", onFormKeyPress);

                        }

                    }

                }

            },

            /**
            * @method _showMenu
            * @description Shows the button's menu.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event) that triggered
            * the display of the menu.
            */
            _showMenu: function (p_oEvent) {

                if (YAHOO.widget.MenuManager) {

                    YAHOO.widget.MenuManager.hideVisible();

                }

                if (m_oOverlayManager) {

                    m_oOverlayManager.hideAll();

                }

                var nViewportOffset = Overlay.VIEWPORT_OFFSET,

                    oMenu = this._menu,
                    oButton = this,
                    oButtonEL = oButton.get("element"),
                    bMenuFlipped = false,
                    nButtonY = Dom.getY(oButtonEL),
                    nScrollTop = Dom.getDocumentScrollTop(),
                    nMenuMinScrollHeight,
                    nMenuHeight,
                    oMenuShadow;

                if (nScrollTop) {

                    nButtonY = nButtonY - nScrollTop;

                }

                var nTopRegion = nButtonY,
                    nBottomRegion = (Dom.getViewportHeight() -
                        (nButtonY + oButtonEL.offsetHeight));

                /*
                     Uses the Button's position to calculate the availble height
                     above and below it to display its corresponding Menu.
                */

                function getMenuDisplayRegionHeight() {

                    if (bMenuFlipped) {

                        return (nTopRegion - nViewportOffset);

                    }
                    else {

                        return (nBottomRegion - nViewportOffset);

                    }

                }

                /*
                    Sets the Menu's "maxheight" configuration property and trys to
                    place the Menu in the best possible position (either above or
                    below its corresponding Button).
                */

                function sizeAndPositionMenu() {

                    var nDisplayRegionHeight = getMenuDisplayRegionHeight();

                    if (nMenuHeight > nDisplayRegionHeight) {

                        nMenuMinScrollHeight = oMenu.cfg.getProperty("minscrollheight");

                        if (nDisplayRegionHeight > nMenuMinScrollHeight) {

                            oMenu.cfg.setProperty("maxheight",
                                        nDisplayRegionHeight);

                            if (bMenuFlipped) {

                                oMenu.align("bl", "tl");

                            }

                        }

                        if (nDisplayRegionHeight < nMenuMinScrollHeight) {

                            if (bMenuFlipped) {

                                /*
                                     All possible positions and values for the
                                     "maxheight" configuration property have been
                                     tried, but none were successful, so fall back
                                     to the original size and position.
                                */

                                oMenu.cfg.setProperty("context",
                                    [oButtonEL, "tl", "bl"], true);

                                oMenu.align("tl", "bl");

                            }
                            else {

                                oMenu.cfg.setProperty("context",
                                    [oButtonEL, "bl", "tl"], true);

                                oMenu.align("bl", "tl");

                                bMenuFlipped = true;

                                return sizeAndPositionMenu();

                            }

                        }

                    }

                }

                if (Menu && oMenu && (oMenu instanceof Menu)) {

                    oMenu.cfg.applyConfig({ context: [oButtonEL, "tl", "bl"],
                        clicktohide: false,
                        visible: true });

                    oMenu.cfg.fireQueue();

                    oMenu.cfg.setProperty("maxheight", 0);

                    oMenu.align("tl", "bl");

                    /*
                        Stop the propagation of the event so that the MenuManager
                        doesn't blur the menu after it gets focus.
                    */

                    if (p_oEvent.type == "mousedown") {

                        Event.stopPropagation(p_oEvent);

                    }

                    nMenuHeight = oMenu.element.offsetHeight;

                    oMenuShadow = oMenu.element.lastChild;

                    sizeAndPositionMenu();

                    if (this.get("focusmenu")) {

                        this._menu.focus();

                    }

                }
                else if (Overlay && oMenu && (oMenu instanceof Overlay)) {

                    oMenu.show();
                    oMenu.align("tl", "bl");

                    var nDisplayRegionHeight = getMenuDisplayRegionHeight();

                    nMenuHeight = oMenu.element.offsetHeight;

                    if (nDisplayRegionHeight < nMenuHeight) {

                        oMenu.align("bl", "tl");

                        bMenuFlipped = true;

                        nDisplayRegionHeight = getMenuDisplayRegionHeight();

                        if (nDisplayRegionHeight < nMenuHeight) {

                            oMenu.align("tl", "bl");

                        }

                    }

                }

            },

            /**
            * @method _hideMenu
            * @description Hides the button's menu.
            * @protected
            */
            _hideMenu: function () {

                var oMenu = this._menu;

                if (oMenu) {

                    oMenu.hide();

                }

            },

            // Protected event handlers

            /**
            * @method _onMouseOver
            * @description "mouseover" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onMouseOver: function (p_oEvent) {

                if (!this._hasMouseEventHandlers) {

                    this.on("mouseout", this._onMouseOut);
                    this.on("mousedown", this._onMouseDown);
                    this.on("mouseup", this._onMouseUp);

                    this._hasMouseEventHandlers = true;

                }

                this.addStateCSSClasses("hover");

                if (this._activationButtonPressed) {

                    this.addStateCSSClasses("active");

                }

                if (this._bOptionPressed) {

                    this.addStateCSSClasses("activeoption");

                }

                if (this._activationButtonPressed || this._bOptionPressed) {

                    Event.removeListener(document, "mouseup", this._onDocumentMouseUp);

                }

            },

            /**
            * @method _onMouseOut
            * @description "mouseout" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onMouseOut: function (p_oEvent) {

                this.removeStateCSSClasses("hover");

                if (this.get("type") != "menu") {

                    this.removeStateCSSClasses("active");

                }

                if (this._activationButtonPressed || this._bOptionPressed) {

                    Event.on(document, "mouseup", this._onDocumentMouseUp,
                        null, this);

                }

            },

            /**
            * @method _onDocumentMouseUp
            * @description "mouseup" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onDocumentMouseUp: function (p_oEvent) {

                this._activationButtonPressed = false;
                this._bOptionPressed = false;

                var sType = this.get("type"),
                    oTarget,
                    oMenuElement;

                if (sType == "menu" || sType == "split") {

                    oTarget = Event.getTarget(p_oEvent);
                    oMenuElement = this._menu.element;

                    if (oTarget != oMenuElement &&
                        !Dom.isAncestor(oMenuElement, oTarget)) {

                        this.removeStateCSSClasses((sType == "menu" ?
                            "active" : "activeoption"));

                        this._hideMenu();

                    }

                }

                Event.removeListener(document, "mouseup", this._onDocumentMouseUp);

            },

            /**
            * @method _onMouseDown
            * @description "mousedown" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onMouseDown: function (p_oEvent) {

                var sType,
                    oElement,
                    nX,
                    me;

                function onMouseUp() {

                    this._hideMenu();
                    this.removeListener("mouseup", onMouseUp);

                }

                if ((p_oEvent.which || p_oEvent.button) == 1) {

                    if (!this.hasFocus()) {

                        this.focus();

                    }

                    sType = this.get("type");

                    if (sType == "split") {

                        oElement = this.get("element");
                        nX = Event.getPageX(p_oEvent) - Dom.getX(oElement);

                        if ((oElement.offsetWidth - this.OPTION_AREA_WIDTH) < nX) {

                            this.fireEvent("option", p_oEvent);

                        }
                        else {

                            this.addStateCSSClasses("active");

                            this._activationButtonPressed = true;

                        }

                    }
                    else if (sType == "menu") {

                        if (this.isActive()) {

                            this._hideMenu();

                            this._activationButtonPressed = false;

                        }
                        else {

                            this._showMenu(p_oEvent);

                            this._activationButtonPressed = true;

                        }

                    }
                    else {

                        this.addStateCSSClasses("active");

                        this._activationButtonPressed = true;

                    }

                    if (sType == "split" || sType == "menu") {

                        me = this;

                        this._hideMenuTimerId = window.setTimeout(function () {

                            me.on("mouseup", onMouseUp);

                        }, 250);

                    }

                }

            },

            /**
            * @method _onMouseUp
            * @description "mouseup" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onMouseUp: function (p_oEvent) {

                var sType = this.get("type");

                if (this._hideMenuTimerId) {

                    window.clearTimeout(this._hideMenuTimerId);

                }

                if (sType == "checkbox" || sType == "radio") {

                    this.set("checked", !(this.get("checked")));

                }

                this._activationButtonPressed = false;

                if (this.get("type") != "menu") {

                    this.removeStateCSSClasses("active");

                }

            },

            /**
            * @method _onFocus
            * @description "focus" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onFocus: function (p_oEvent) {

                var oElement;

                this.addStateCSSClasses("focus");

                if (this._activationKeyPressed) {

                    this.addStateCSSClasses("active");

                }

                m_oFocusedButton = this;

                if (!this._hasKeyEventHandlers) {

                    oElement = this._button;

                    Event.on(oElement, "blur", this._onBlur, null, this);
                    Event.on(oElement, "keydown", this._onKeyDown, null, this);
                    Event.on(oElement, "keyup", this._onKeyUp, null, this);

                    this._hasKeyEventHandlers = true;

                }

                this.fireEvent("focus", p_oEvent);

            },

            /**
            * @method _onBlur
            * @description "blur" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onBlur: function (p_oEvent) {

                this.removeStateCSSClasses("focus");

                if (this.get("type") != "menu") {

                    this.removeStateCSSClasses("active");

                }

                if (this._activationKeyPressed) {

                    Event.on(document, "keyup", this._onDocumentKeyUp, null, this);

                }

                m_oFocusedButton = null;

                this.fireEvent("blur", p_oEvent);

            },

            /**
            * @method _onDocumentKeyUp
            * @description "keyup" event handler for the document.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onDocumentKeyUp: function (p_oEvent) {

                if (this._isActivationKey(Event.getCharCode(p_oEvent))) {

                    this._activationKeyPressed = false;

                    Event.removeListener(document, "keyup", this._onDocumentKeyUp);

                }

            },

            /**
            * @method _onKeyDown
            * @description "keydown" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onKeyDown: function (p_oEvent) {

                var oMenu = this._menu;

                if (this.get("type") == "split" &&
                    this._isSplitButtonOptionKey(p_oEvent)) {

                    this.fireEvent("option", p_oEvent);

                }
                else if (this._isActivationKey(Event.getCharCode(p_oEvent))) {

                    if (this.get("type") == "menu") {

                        this._showMenu(p_oEvent);

                    }
                    else {

                        this._activationKeyPressed = true;

                        this.addStateCSSClasses("active");

                    }

                }

                if (oMenu && oMenu.cfg.getProperty("visible") &&
                    Event.getCharCode(p_oEvent) == 27) {

                    oMenu.hide();
                    this.focus();

                }

            },

            /**
            * @method _onKeyUp
            * @description "keyup" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onKeyUp: function (p_oEvent) {

                var sType;

                if (this._isActivationKey(Event.getCharCode(p_oEvent))) {

                    sType = this.get("type");

                    if (sType == "checkbox" || sType == "radio") {

                        this.set("checked", !(this.get("checked")));

                    }

                    this._activationKeyPressed = false;

                    if (this.get("type") != "menu") {

                        this.removeStateCSSClasses("active");

                    }

                }

            },

            /**
            * @method _onClick
            * @description "click" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onClick: function (p_oEvent) {

                var sType = this.get("type"),
                    sTitle,
                    oForm,
                    oSrcElement,
                    oElement,
                    nX;

                switch (sType) {

                case "radio":
                case "checkbox":

                    if (this.get("checked")) {

                        sTitle = (sType == "radio") ?
                                    this.RADIO_CHECKED_TITLE :
                                    this.CHECKBOX_CHECKED_TITLE;

                    }
                    else {

                        sTitle = (sType == "radio") ?
                                    this.RADIO_DEFAULT_TITLE :
                                    this.CHECKBOX_DEFAULT_TITLE;

                    }

                    this.set("title", sTitle);

                    break;

                case "submit":

                    this.submitForm();

                    break;

                case "reset":

                    oForm = this.getForm();

                    if (oForm) {

                        oForm.reset();

                    }

                    break;

                case "menu":

                    sTitle = this._menu.cfg.getProperty("visible") ?
                                    this.MENUBUTTON_MENU_VISIBLE_TITLE :
                                    this.MENUBUTTON_DEFAULT_TITLE;

                    this.set("title", sTitle);

                    break;

                case "split":

                    oElement = this.get("element");
                    nX = Event.getPageX(p_oEvent) - Dom.getX(oElement);

                    if ((oElement.offsetWidth - this.OPTION_AREA_WIDTH) < nX) {

                        return false;

                    }
                    else {

                        this._hideMenu();

                        oSrcElement = this.get("srcelement");

                        if (oSrcElement && oSrcElement.type == "submit") {

                            this.submitForm();

                        }

                    }

                    sTitle = this._menu.cfg.getProperty("visible") ?
                                    this.SPLITBUTTON_OPTION_VISIBLE_TITLE :
                                    this.SPLITBUTTON_DEFAULT_TITLE;

                    this.set("title", sTitle);

                    break;

                }

            },

            /**
            * @method _onAppendTo
            * @description "appendTo" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onAppendTo: function (p_oEvent) {

                /*
                    It is necessary to call "_addListenersToForm" using
                    "setTimeout" to make sure that the button's "form" property
                    returns a node reference.  Sometimes, if you try to get the
                    reference immediately after appending the field, it is null.
                */

                var me = this;

                window.setTimeout(function () {

                    me._addListenersToForm();

                }, 0);

            },

            /**
            * @method _onFormReset
            * @description "reset" event handler for the button's form.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event
            * object passed back by the event utility (YAHOO.util.Event).
            */
            _onFormReset: function (p_oEvent) {

                var sType = this.get("type"),
                    oMenu = this._menu;

                if (sType == "checkbox" || sType == "radio") {

                    this.resetValue("checked");

                }

                if (Menu && oMenu && (oMenu instanceof Menu)) {

                    this.resetValue("selectedMenuItem");

                }

            },

            /**
            * @method _onDocumentMouseDown
            * @description "mousedown" event handler for the document.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onDocumentMouseDown: function (p_oEvent) {

                var oTarget = Event.getTarget(p_oEvent),
                    oButtonElement = this.get("element"),
                    oMenuElement = this._menu.element;

                if (oTarget != oButtonElement &&
                    !Dom.isAncestor(oButtonElement, oTarget) &&
                    oTarget != oMenuElement &&
                    !Dom.isAncestor(oMenuElement, oTarget)) {

                    this._hideMenu();

                    Event.removeListener(document, "mousedown",
                        this._onDocumentMouseDown);

                }

            },

            /**
            * @method _onOption
            * @description "option" event handler for the button.
            * @protected
            * @param {Event} p_oEvent Object representing the DOM event object
            * passed back by the event utility (YAHOO.util.Event).
            */
            _onOption: function (p_oEvent) {

                if (this.hasClass("yui-split-button-activeoption")) {

                    this._hideMenu();

                    this._bOptionPressed = false;

                }
                else {

                    this._showMenu(p_oEvent);

                    this._bOptionPressed = true;

                }

            },

            /**
            * @method _onOverlayBeforeShow
            * @description "beforeshow" event handler for the
            * <a href="YAHOO.widget.Overlay.html">YAHOO.widget.Overlay</a> instance
            * serving as the button's menu.
            * @private
            * @param {String} p_sType String representing the name of the event
            * that was fired.
            */
            _onOverlayBeforeShow: function (p_sType) {

                var oMenu = this._menu;

                oMenu.render(this.get("element").parentNode);

                oMenu.beforeShowEvent.unsubscribe(this._onOverlayBeforeShow);

            },

            /**
            * @method _onMenuShow
            * @description "show" event handler for the button's menu.
            * @private
            * @param {String} p_sType String representing the name of the event
            * that was fired.
            */
            _onMenuShow: function (p_sType) {

                Event.on(document, "mousedown", this._onDocumentMouseDown,
                    null, this);

                var sTitle,
                    sState;

                if (this.get("type") == "split") {

                    sTitle = this.SPLITBUTTON_OPTION_VISIBLE_TITLE;
                    sState = "activeoption";

                }
                else {

                    sTitle = this.MENUBUTTON_MENU_VISIBLE_TITLE;
                    sState = "active";

                }

                this.addStateCSSClasses(sState);
                this.set("title", sTitle);

            },

            /**
            * @method _onMenuHide
            * @description "hide" event handler for the button's menu.
            * @private
            * @param {String} p_sType String representing the name of the event
            * that was fired.
            */
            _onMenuHide: function (p_sType) {

                var oMenu = this._menu,
                    sTitle,
                    sState;

                if (this.get("type") == "split") {

                    sTitle = this.SPLITBUTTON_DEFAULT_TITLE;
                    sState = "activeoption";

                }
                else {

                    sTitle = this.MENUBUTTON_DEFAULT_TITLE;
                    sState = "active";
                }

                this.removeStateCSSClasses(sState);
                this.set("title", sTitle);

                if (this.get("type") == "split") {

                    this._bOptionPressed = false;

                }

            },

            /**
            * @method _onMenuKeyDown
            * @description "keydown" event handler for the button's menu.
            * @private
            * @param {String} p_sType String representing the name of the event
            * that was fired.
            * @param {Array} p_aArgs Array of arguments sent when the event
            * was fired.
            */
            _onMenuKeyDown: function (p_sType, p_aArgs) {

                var oEvent = p_aArgs[0];

                if (Event.getCharCode(oEvent) == 27) {

                    this.focus();

                    if (this.get("type") == "split") {

                        this._bOptionPressed = false;

                    }

                }

            },

            /**
            * @method _onMenuRender
            * @description "render" event handler for the button's menu.
            * @private
            * @param {String} p_sType String representing the name of the
            * event thatwas fired.
            */
            _onMenuRender: function (p_sType) {

                var oButtonElement = this.get("element"),
                    oButtonParent = oButtonElement.parentNode,
                    oMenuElement = this._menu.element;

                if (oButtonParent != oMenuElement.parentNode) {

                    oButtonParent.appendChild(oMenuElement);

                }

                this.set("selectedMenuItem", this.get("selectedMenuItem"));

            },

            /**
            * @method _onMenuItemSelected
            * @description "selectedchange" event handler for each item in the
            * button's menu.
            * @private
            * @param {String} p_sType String representing the name of the event
            * that was fired.
            * @param {Array} p_aArgs Array of arguments sent when the event
            * was fired.
            * @param {MenuItem} p_oItem Object representing the menu item that
            * subscribed to the event.
            */
            _onMenuItemSelected: function (p_sType, p_aArgs, p_oItem) {

                var bSelected = p_aArgs[0];

                if (bSelected) {

                    this.set("selectedMenuItem", p_oItem);

                }

            },

            /**
            * @method _onMenuItemAdded
            * @description "itemadded" event handler for the button's menu.
            * @private
            * @param {String} p_sType String representing the name of the event
            * that was fired.
            * @param {Array} p_aArgs Array of arguments sent when the event
            * was fired.
            * @param {<a href="YAHOO.widget.MenuItem.html">
            * YAHOO.widget.MenuItem</a>} p_oItem Object representing the menu
            * item that subscribed to the event.
            */
            _onMenuItemAdded: function (p_sType, p_aArgs, p_oItem) {

                var oItem = p_aArgs[0];

                oItem.cfg.subscribeToConfigEvent("selected",
                    this._onMenuItemSelected, oItem, this);

            },

            /**
            * @method _onMenuClick
            * @description "click" event handler for the button's menu.
            * @private
            * @param {String} p_sType String representing the name of the event
            * that was fired.
            * @param {Array} p_aArgs Array of arguments sent when the event
            * was fired.
            */
            _onMenuClick: function (p_sType, p_aArgs) {

                var oItem = p_aArgs[1],
                    oSrcElement;

                if (oItem) {

                    oSrcElement = this.get("srcelement");

                    if (oSrcElement && oSrcElement.type == "submit") {

                        this.submitForm();

                    }

                    this._hideMenu();

                }

            },

            // Public methods

            /**
            * @method createButtonElement
            * @description Creates the button's HTML elements.
            * @param {String} p_sType String indicating the type of element
            * to create.
            * @return {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
            * level-one-html.html#ID-58190037">HTMLElement</a>}
            */
            createButtonElement: function (p_sType) {

                var sNodeName = this.NODE_NAME,
                    oElement = document.createElement(sNodeName);

                oElement.innerHTML =  "<" + sNodeName + " class=\"first-child\">" +
                    (p_sType == "link" ? "<a></a>" :
                    "<button type=\"button\"></button>") + "</" + sNodeName + ">";

                return oElement;

            },

            /**
            * @method addStateCSSClasses
            * @description Appends state-specific CSS classes to the button's root
            * DOM element.
            */
            addStateCSSClasses: function (p_sState) {

                var sType = this.get("type");

                if (Lang.isString(p_sState)) {

                    if (p_sState != "activeoption") {

                        this.addClass(this.CSS_CLASS_NAME + ("-" + p_sState));

                    }

                    this.addClass("yui-" + sType + ("-button-" + p_sState));

                }

            },

            /**
            * @method removeStateCSSClasses
            * @description Removes state-specific CSS classes to the button's root
            * DOM element.
            */
            removeStateCSSClasses: function (p_sState) {

                var sType = this.get("type");

                if (Lang.isString(p_sState)) {

                    this.removeClass(this.CSS_CLASS_NAME + ("-" + p_sState));
                    this.removeClass("yui-" + sType + ("-button-" + p_sState));

                }

            },

            /**
            * @method createHiddenFields
            * @description Creates the button's hidden form field and appends it
            * to its parent form.
            * @return {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
            * level-one-html.html#ID-6043025">HTMLInputElement</a>|Array}
            */
            createHiddenFields: function () {

                this.removeHiddenFields();

                var oForm = this.getForm(),
                    oButtonField,
                    sType,
                    bCheckable,
                    oMenu,
                    oMenuItem,
                    sName,
                    oValue,
                    oMenuField;

                if (oForm && !this.get("disabled")) {

                    sType = this.get("type");
                    bCheckable = (sType == "checkbox" || sType == "radio");

                    if (bCheckable || (m_oSubmitTrigger == this)) {

                        this.logger.log("Creating hidden field.");

                        oButtonField = createInputElement(
                                        (bCheckable ? sType : "hidden"),
                                        this.get("name"),
                                        this.get("value"),
                                        this.get("checked"));

                        if (oButtonField) {

                            if (bCheckable) {

                                oButtonField.style.display = "none";

                            }

                            oForm.appendChild(oButtonField);

                        }

                    }

                    oMenu = this._menu;

                    if (Menu && oMenu && (oMenu instanceof Menu)) {

                        this.logger.log("Creating hidden field for menu.");

                        oMenuField = oMenu.srcElement;
                        oMenuItem = this.get("selectedMenuItem");

                        if (oMenuItem) {

                            if (oMenuField &&
                                oMenuField.nodeName.toUpperCase() == "SELECT") {

                                oForm.appendChild(oMenuField);
                                oMenuField.selectedIndex = oMenuItem.index;

                            }
                            else {

                                oValue = (oMenuItem.value === null ||
                                            oMenuItem.value === "") ?
                                            oMenuItem.cfg.getProperty("text") :
                                            oMenuItem.value;

                                sName = this.get("name");

                                if (oValue && sName) {

                                    oMenuField = createInputElement("hidden",
                                                        (sName + "_options"),
                                                        oValue);

                                    oForm.appendChild(oMenuField);

                                }

                            }

                        }

                    }

                    if (oButtonField && oMenuField) {

                        this._hiddenFields = [oButtonField, oMenuField];

                    }
                    else if (!oButtonField && oMenuField) {

                        this._hiddenFields = oMenuField;

                    }
                    else if (oButtonField && !oMenuField) {

                        this._hiddenFields = oButtonField;

                    }

                    return this._hiddenFields;

                }

            },

            /**
            * @method removeHiddenFields
            * @description Removes the button's hidden form field(s) from its
            * parent form.
            */
            removeHiddenFields: function () {

                var oField = this._hiddenFields,
                    nFields,
                    i;

                function removeChild(p_oElement) {

                    if (Dom.inDocument(p_oElement)) {

                        p_oElement.parentNode.removeChild(p_oElement);

                    }

                }

                if (oField) {

                    if (Lang.isArray(oField)) {

                        nFields = oField.length;

                        if (nFields > 0) {

                            i = nFields - 1;

                            do {

                                removeChild(oField[i]);

                            }
                            while (i--);

                        }

                    }
                    else {

                        removeChild(oField);

                    }

                    this._hiddenFields = null;

                }

            },

            /**
            * @method submitForm
            * @description Submits the form to which the button belongs.  Returns
            * true if the form was submitted successfully, false if the submission
            * was cancelled.
            * @protected
            * @return {Boolean}
            */
            submitForm: function () {

                var oForm = this.getForm(),

                    oSrcElement = this.get("srcelement"),

                    /*
                        Boolean indicating if the event fired successfully
                        (was not cancelled by any handlers)
                    */

                    bSubmitForm = false,

                    oEvent;

                if (oForm) {

                    if (this.get("type") == "submit" ||
                        (oSrcElement && oSrcElement.type == "submit"))
                    {

                        m_oSubmitTrigger = this;

                    }

                    if (YAHOO.env.ua.ie) {

                        bSubmitForm = oForm.fireEvent("onsubmit");

                    }
                    else {  // Gecko, Opera, and Safari

                        oEvent = document.createEvent("HTMLEvents");
                        oEvent.initEvent("submit", true, true);

                        bSubmitForm = oForm.dispatchEvent(oEvent);

                    }

                    /*
                        In IE and Safari, dispatching a "submit" event to a form
                        WILL cause the form's "submit" event to fire, but WILL NOT
                        submit the form.  Therefore, we need to call the "submit"
                        method as well.
                    */

                    if ((YAHOO.env.ua.ie || YAHOO.env.ua.webkit) && bSubmitForm) {

                        oForm.submit();

                    }

                }

                return bSubmitForm;

            },

            /**
            * @method init
            * @description The Button class's initialization method.
            * @param {String} p_oElement String specifying the id attribute of the
            * <code>&#60;input&#62;</code>, <code>&#60;button&#62;</code>,
            * <code>&#60;a&#62;</code>, or <code>&#60;span&#62;</code> element to
            * be used to create the button.
            * @param {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
            * level-one-html.html#ID-6043025">HTMLInputElement</a>|<a href="http://
            * www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-html.html
            * #ID-34812697">HTMLButtonElement</a>|<a href="http://www.w3.org/TR
            * /2000/WD-DOM-Level-1-20000929/level-one-html.html#ID-33759296">
            * HTMLElement</a>} p_oElement Object reference for the
            * <code>&#60;input&#62;</code>, <code>&#60;button&#62;</code>,
            * <code>&#60;a&#62;</code>, or <code>&#60;span&#62;</code> element to be
            * used to create the button.
            * @param {Object} p_oElement Object literal specifying a set of
            * configuration attributes used to create the button.
            * @param {Object} p_oAttributes Optional. Object literal specifying a
            * set of configuration attributes used to create the button.
            */
            init: function (p_oElement, p_oAttributes) {

                var sNodeName = p_oAttributes.type == "link" ? "a" : "button",
                    oSrcElement = p_oAttributes.srcelement,
                    oButton = p_oElement.getElementsByTagName(sNodeName)[0],
                    oInput;

                if (!oButton) {

                    oInput = p_oElement.getElementsByTagName("input")[0];

                    if (oInput) {

                        oButton = document.createElement("button");
                        oButton.setAttribute("type", "button");

                        oInput.parentNode.replaceChild(oButton, oInput);

                    }

                }

                this._button = oButton;

                YAHOO.widget.Button.superclass.init.call(this, p_oElement,
                    p_oAttributes);

                m_oButtons[this.get("id")] = this;

                this.addClass(this.CSS_CLASS_NAME);

                this.addClass("yui-" + this.get("type") + "-button");

                Event.on(this._button, "focus", this._onFocus, null, this);
                this.on("mouseover", this._onMouseOver);
                this.on("click", this._onClick);
                this.on("appendTo", this._onAppendTo);

                var oContainer = this.get("container"),
                    oElement = this.get("element"),
                    bElInDoc = Dom.inDocument(oElement),
                    oParentNode;

                if (oContainer) {

                    if (oSrcElement && oSrcElement != oElement) {

                        oParentNode = oSrcElement.parentNode;

                        if (oParentNode) {

                            oParentNode.removeChild(oSrcElement);

                        }

                    }

                    if (Lang.isString(oContainer)) {

                        Event.onContentReady(oContainer, function () {

                            this.appendTo(oContainer);

                        }, null, this);

                    }
                    else {

                        this.appendTo(oContainer);

                    }

                }
                else if (!bElInDoc && oSrcElement && oSrcElement != oElement) {

                    oParentNode = oSrcElement.parentNode;

                    if (oParentNode) {

                        this.fireEvent("beforeAppendTo", {
                            type: "beforeAppendTo",
                            target: oParentNode
                        });

                        oParentNode.replaceChild(oElement, oSrcElement);

                        this.fireEvent("appendTo", {
                            type: "appendTo",
                            target: oParentNode
                        });

                    }

                }
                else if (this.get("type") != "link" && bElInDoc && oSrcElement &&
                    oSrcElement == oElement) {

                    this._addListenersToForm();

                }

                this.logger.log("Initialization completed.");

            },

            /**
            * @method initAttributes
            * @description Initializes all of the configuration attributes used to
            * create the button.
            * @param {Object} p_oAttributes Object literal specifying a set of
            * configuration attributes used to create the button.
            */
            initAttributes: function (p_oAttributes) {

                var oAttributes = p_oAttributes || {};

                YAHOO.widget.Button.superclass.initAttributes.call(this,
                    oAttributes);

                /**
                * @attribute type
                * @description String specifying the button's type.  Possible
                * values are: "push," "link," "submit," "reset," "checkbox,"
                * "radio," "menu," and "split."
                * @default "push"
                * @type String
                */
                this.setAttributeConfig("type", {

                    value: (oAttributes.type || "push"),
                    validator: Lang.isString,
                    writeOnce: true,
                    method: this._setType

                });

                /**
                * @attribute label
                * @description String specifying the button's text label
                * or innerHTML.
                * @default null
                * @type String
                */
                this.setAttributeConfig("label", {

                    value: oAttributes.label,
                    validator: Lang.isString,
                    method: this._setLabel

                });

                /**
                * @attribute value
                * @description Object specifying the value for the button.
                * @default null
                * @type Object
                */
                this.setAttributeConfig("value", {

                    value: oAttributes.value

                });

                /**
                * @attribute name
                * @description String specifying the name for the button.
                * @default null
                * @type String
                */
                this.setAttributeConfig("name", {

                    value: oAttributes.name,
                    validator: Lang.isString

                });

                /**
                * @attribute tabindex
                * @description Number specifying the tabindex for the button.
                * @default null
                * @type Number
                */
                this.setAttributeConfig("tabindex", {

                    value: oAttributes.tabindex,
                    validator: Lang.isNumber,
                    method: this._setTabIndex

                });

                /**
                * @attribute title
                * @description String specifying the title for the button.
                * @default null
                * @type String
                */
                this.configureAttribute("title", {

                    value: oAttributes.title,
                    validator: Lang.isString,
                    method: this._setTitle

                });

                /**
                * @attribute disabled
                * @description Boolean indicating if the button should be disabled.
                * (Disabled buttons are dimmed and will not respond to user input
                * or fire events.  Does not apply to button's of type "link.")
                * @default false
                * @type Boolean
                */
                this.setAttributeConfig("disabled", {

                    value: (oAttributes.disabled || false),
                    validator: Lang.isBoolean,
                    method: this._setDisabled

                });

                /**
                * @attribute href
                * @description String specifying the href for the button.  Applies
                * only to buttons of type "link."
                * @type String
                */
                this.setAttributeConfig("href", {

                    value: oAttributes.href,
                    validator: Lang.isString,
                    method: this._setHref

                });

                /**
                * @attribute target
                * @description String specifying the target for the button.
                * Applies only to buttons of type "link."
                * @type String
                */
                this.setAttributeConfig("target", {

                    value: oAttributes.target,
                    validator: Lang.isString,
                    method: this._setTarget

                });

                /**
                * @attribute checked
                * @description Boolean indicating if the button is checked.
                * Applies only to buttons of type "radio" and "checkbox."
                * @default false
                * @type Boolean
                */
                this.setAttributeConfig("checked", {

                    value: (oAttributes.checked || false),
                    validator: Lang.isBoolean,
                    method: this._setChecked

                });

                /**
                * @attribute container
                * @description HTML element reference or string specifying the id
                * attribute of the HTML element that the button's markup should be
                * rendered into.
                * @type <a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
                * level-one-html.html#ID-58190037">HTMLElement</a>|String
                * @default null
                */
                this.setAttributeConfig("container", {

                    value: oAttributes.container,
                    writeOnce: true

                });

                /**
                * @attribute srcelement
                * @description Object reference to the HTML element (either
                * <code>&#60;input&#62;</code> or <code>&#60;span&#62;</code>)
                * used to create the button.
                * @type <a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
                * level-one-html.html#ID-58190037">HTMLElement</a>|String
                * @default null
                */
                this.setAttributeConfig("srcelement", {

                    value: oAttributes.srcelement,
                    writeOnce: true

                });

                /**
                * @attribute menu
                * @description Object specifying the menu for the button.
                * The value can be one of the following:
                * <ul>
                * <li>Object specifying a <a href="YAHOO.widget.Menu.html">
                * YAHOO.widget.Menu</a> instance.</li>
                * <li>Object specifying a <a href="YAHOO.widget.Overlay.html">
                * YAHOO.widget.Overlay</a> instance.</li>
                * <li>String specifying the id attribute of the <code>&#60;div&#62;
                * </code> element used to create the menu.  By default the menu
                * will be created as an instance of
                * <a href="YAHOO.widget.Overlay.html">YAHOO.widget.Overlay</a>.
                * If the <a href="YAHOO.widget.Menu.html#CSS_CLASS_NAME">
                * default CSS class name for YAHOO.widget.Menu</a> is applied to
                * the <code>&#60;div&#62;</code> element, it will be created as an
                * instance of <a href="YAHOO.widget.Menu.html">YAHOO.widget.Menu
                * </a>.</li><li>String specifying the id attribute of the
                * <code>&#60;select&#62;</code> element used to create the menu.
                * </li><li>Object specifying the <code>&#60;div&#62;</code> element
                * used to create the menu.</li>
                * <li>Object specifying the <code>&#60;select&#62;</code> element
                * used to create the menu.</li>
                * <li>Array of object literals, each representing a set of
                * <a href="YAHOO.widget.MenuItem.html">YAHOO.widget.MenuItem</a>
                * configuration attributes.</li>
                * <li>Array of strings representing the text labels for each menu
                * item in the menu.</li>
                * </ul>
                * @type <a href="YAHOO.widget.Menu.html">YAHOO.widget.Menu</a>|<a
                * href="YAHOO.widget.Overlay.html">YAHOO.widget.Overlay</a>|<a
                * href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-
                * one-html.html#ID-58190037">HTMLElement</a>|String|Array
                * @default null
                */
                this.setAttributeConfig("menu", {

                    value: null,
                    method: this._setMenu,
                    writeOnce: true

                });

                /**
                * @attribute lazyloadmenu
                * @description Boolean indicating the value to set for the
                * <a href="YAHOO.widget.Menu.html#lazyLoad">"lazyload"</a>
                * configuration property of the button's menu.  Setting
                * "lazyloadmenu" to <code>true </code> will defer rendering of
                * the button's menu until the first time it is made visible.
                * If "lazyloadmenu" is set to <code>false</code>, the button's
                * menu will be rendered immediately if the button is in the
                * document, or in response to the button's "appendTo" event if
                * the button is not yet in the document.  In either case, the
                * menu is rendered into the button's parent HTML element.
                * <em>This attribute does not apply if a
                * <a href="YAHOO.widget.Menu.html">YAHOO.widget.Menu</a> or
                * <a href="YAHOO.widget.Overlay.html">YAHOO.widget.Overlay</a>
                * instance is passed as the value of the button's "menu"
                * configuration attribute. <a href="YAHOO.widget.Menu.html">
                * YAHOO.widget.Menu</a> or <a href="YAHOO.widget.Overlay.html">
                * YAHOO.widget.Overlay</a> instances should be rendered before
                * being set as the value for the "menu" configuration
                * attribute.</em>
                * @default true
                * @type Boolean
                */
                this.setAttributeConfig("lazyloadmenu", {

                    value: (oAttributes.lazyloadmenu === false ? false : true),
                    validator: Lang.isBoolean,
                    writeOnce: true

                });

                /**
                * @attribute menuclassname
                * @description String representing the CSS class name to be
                * applied to the root element of the button's menu.
                * @type String
                * @default "yui-button-menu"
                */
                this.setAttributeConfig("menuclassname", {

                    value: (oAttributes.menuclassname || "yui-button-menu"),
                    validator: Lang.isString,
                    method: this._setMenuClassName,
                    writeOnce: true

                });

                /**
                * @attribute selectedMenuItem
                * @description Object representing the item in the button's menu
                * that is currently selected.
                * @type Number
                * @default null
                */
                this.setAttributeConfig("selectedMenuItem", {

                    value: null,
                    method: this._setSelectedMenuItem

                });

                /**
                * @attribute onclick
                * @description Object literal representing the code to be executed
                * when the button is clicked.  Format:<br> <code> {<br>
                * <strong>fn:</strong> Function,   &#47;&#47; The handler to call
                * when the event fires.<br> <strong>obj:</strong> Object,
                * &#47;&#47; An object to pass back to the handler.<br>
                * <strong>scope:</strong> Object &#47;&#47;  The object to use
                * for the scope of the handler.<br> } </code>
                * @type Object
                * @default null
                */
                this.setAttributeConfig("onclick", {

                    value: oAttributes.onclick,
                    method: this._setOnClick

                });

                /**
                * @attribute focusmenu
                * @description Boolean indicating whether or not the button's menu
                * should be focused when it is made visible.
                * @type Boolean
                * @default true
                */
                this.setAttributeConfig("focusmenu", {

                    value: (oAttributes.focusmenu === false ? false : true),
                    validator: Lang.isBoolean

                });

            },

            /**
            * @method focus
            * @description Causes the button to receive the focus and fires the
            * button's "focus" event.
            */
            focus: function () {

                if (!this.get("disabled")) {

                    this._button.focus();

                }

            },

            /**
            * @method blur
            * @description Causes the button to lose focus and fires the button's
            * "blur" event.
            */
            blur: function () {

                if (!this.get("disabled")) {

                    this._button.blur();

                }

            },

            /**
            * @method hasFocus
            * @description Returns a boolean indicating whether or not the button
            * has focus.
            * @return {Boolean}
            */
            hasFocus: function () {

                return (m_oFocusedButton == this);

            },

            /**
            * @method isActive
            * @description Returns a boolean indicating whether or not the button
            * is active.
            * @return {Boolean}
            */
            isActive: function () {

                return this.hasClass(this.CSS_CLASS_NAME + "-active");

            },

            /**
            * @method getMenu
            * @description Returns a reference to the button's menu.
            * @return {<a href="YAHOO.widget.Overlay.html">
            * YAHOO.widget.Overlay</a>|<a
            * href="YAHOO.widget.Menu.html">YAHOO.widget.Menu</a>}
            */
            getMenu: function () {

                return this._menu;

            },

            /**
            * @method getForm
            * @description Returns a reference to the button's parent form.
            * @return {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-
            * 20000929/level-one-html.html#ID-40002357">HTMLFormElement</a>}
            */
            getForm: function () {

                return this._button.form;

            },

            /**
            * @method getHiddenFields
            * @description Returns an <code>&#60;input&#62;</code> element or
            * array of form elements used to represent the button when its parent
            * form is submitted.
            * @return {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
            * level-one-html.html#ID-6043025">HTMLInputElement</a>|Array}
            */
            getHiddenFields: function () {

                return this._hiddenFields;

            },

            /**
            * @method destroy
            * @description Removes the button's element from its parent element and
            * removes all event handlers.
            */
            destroy: function () {

                this.logger.log("Destroying ...");

                var oElement = this.get("element"),
                    oParentNode = oElement.parentNode,
                    oMenu = this._menu,
                    aButtons;

                if (oMenu) {

                    this.logger.log("Destroying menu.");

                    if (m_oOverlayManager && m_oOverlayManager.find(oMenu)) {

                        m_oOverlayManager.remove(oMenu);

                    }

                    oMenu.destroy();

                }

                this.logger.log("Removing DOM event listeners.");

                Event.purgeElement(oElement);
                Event.purgeElement(this._button);
                Event.removeListener(document, "mouseup", this._onDocumentMouseUp);
                Event.removeListener(document, "keyup", this._onDocumentKeyUp);
                Event.removeListener(document, "mousedown",
                    this._onDocumentMouseDown);

                var oForm = this.getForm();

                if (oForm) {

                    Event.removeListener(oForm, "reset", this._onFormReset);
                    Event.removeListener(oForm, "submit", this.createHiddenFields);

                }

                this.logger.log("Removing CustomEvent listeners.");

                this.unsubscribeAll();

                if (oParentNode) {

                    oParentNode.removeChild(oElement);

                }

                this.logger.log("Removing from document.");

                delete m_oButtons[this.get("id")];

                aButtons = Dom.getElementsByClassName(this.CSS_CLASS_NAME,
                                    this.NODE_NAME, oForm);

                if (Lang.isArray(aButtons) && aButtons.length === 0) {

                    Event.removeListener(oForm, "keypress",
                            YAHOO.widget.Button.onFormKeyPress);

                }

                this.logger.log("Destroyed.");

            },

            fireEvent: function (p_sType , p_aArgs) {

    			var sType = arguments[0];

    			//  Disabled buttons should not respond to DOM events

    			if (this.DOM_EVENTS[sType] && this.get("disabled")) {

    				return;

    			}

    			return YAHOO.widget.Button.superclass.fireEvent.apply(this, arguments);

            },

            /**
            * @method toString
            * @description Returns a string representing the button.
            * @return {String}
            */
            toString: function () {

                return ("Button " + this.get("id"));

            }

        });

        /**
        * @method YAHOO.widget.Button.onFormKeyPress
        * @description "keypress" event handler for the button's form.
        * @param {Event} p_oEvent Object representing the DOM event object passed
        * back by the event utility (YAHOO.util.Event).
        */
        YAHOO.widget.Button.onFormKeyPress = function (p_oEvent) {

            var oTarget = Event.getTarget(p_oEvent),
                nCharCode = Event.getCharCode(p_oEvent),
                sNodeName = oTarget.nodeName && oTarget.nodeName.toUpperCase(),
                sType = oTarget.type,

                /*
                    Boolean indicating if the form contains any enabled or
                    disabled YUI submit buttons
                */

                bFormContainsYUIButtons = false,

                oButton,

                oYUISubmitButton,   // The form's first, enabled YUI submit button

                /*
                     The form's first, enabled HTML submit button that precedes any
                     YUI submit button
                */

                oPrecedingSubmitButton,

                /*
                     The form's first, enabled HTML submit button that follows a
                     YUI button
                */

                oFollowingSubmitButton;

            function isSubmitButton(p_oElement) {

                var sId,
                    oSrcElement;

                switch (p_oElement.nodeName.toUpperCase()) {

                case "INPUT":
                case "BUTTON":

                    if (p_oElement.type == "submit" && !p_oElement.disabled) {

                        if (!bFormContainsYUIButtons &&
                            !oPrecedingSubmitButton) {

                            oPrecedingSubmitButton = p_oElement;

                        }

                        if (oYUISubmitButton && !oFollowingSubmitButton) {

                            oFollowingSubmitButton = p_oElement;

                        }

                    }

                    break;

                default:

                    sId = p_oElement.id;

                    if (sId) {

                        oButton = m_oButtons[sId];

                        if (oButton) {

                            bFormContainsYUIButtons = true;

                            if (!oButton.get("disabled")) {

                                oSrcElement = oButton.get("srcelement");

                                if (!oYUISubmitButton &&
                                    (oButton.get("type") == "submit" ||
                                    (oSrcElement && oSrcElement.type == "submit")))
                                {

                                    oYUISubmitButton = oButton;

                                }

                            }

                        }

                    }

                    break;

                }

            }

            if (nCharCode == 13 && ((sNodeName == "INPUT" && (sType == "text" ||
                sType == "password" || sType == "checkbox" || sType == "radio" ||
                sType == "file")) || sNodeName == "SELECT"))
            {

                Dom.getElementsBy(isSubmitButton, "*", this);

                if (oPrecedingSubmitButton) {

                    /*
                         Need to set focus to the first enabled submit button
                         to make sure that IE includes its name and value
                         in the form's data set.
                    */

                    oPrecedingSubmitButton.focus();

                }
                else if (!oPrecedingSubmitButton && oYUISubmitButton) {

                    if (oFollowingSubmitButton) {

                        /*
                            Need to call "preventDefault" to ensure that
                            the name and value of the regular submit button
                            following the YUI button doesn't get added to the
                            form's data set when it is submitted.
                        */

                        Event.preventDefault(p_oEvent);

                    }

                    oYUISubmitButton.submitForm();

                }

            }

        };

        /**
        * @method YAHOO.widget.Button.addHiddenFieldsToForm
        * @description Searches the specified form and adds hidden fields for
        * instances of YAHOO.widget.Button that are of type "radio," "checkbox,"
        * "menu," and "split."
        * @param {<a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-
        * one-html.html#ID-40002357">HTMLFormElement</a>} p_oForm Object reference
        * for the form to search.
        */
        YAHOO.widget.Button.addHiddenFieldsToForm = function (p_oForm) {

            var aButtons = Dom.getElementsByClassName(
                                YAHOO.widget.Button.prototype.CSS_CLASS_NAME,
                                "*",
                                p_oForm),

                nButtons = aButtons.length,
                oButton,
                sId,
                i;

            if (nButtons > 0) {

                YAHOO.log("Form contains " + nButtons + " YUI buttons.");

                for (i = 0; i < nButtons; i++) {

                    sId = aButtons[i].id;

                    if (sId) {

                        oButton = m_oButtons[sId];

                        if (oButton) {

                            oButton.createHiddenFields();

                        }

                    }

                }

            }

        };

        /**
        * @method YAHOO.widget.Button.getButton
        * @description Returns a button with the specified id.
        * @param {String} p_sId String specifying the id of the root node of the
        * HTML element representing the button to be retrieved.
        * @return {YAHOO.widget.Button}
        */
        YAHOO.widget.Button.getButton = function (p_sId) {

            var oButton = m_oButtons[p_sId];

            if (oButton) {

                return oButton;

            }

        };

        // Events

        /**
        * @event focus
        * @description Fires when the menu item receives focus.  Passes back a
        * single object representing the original DOM event object passed back by
        * the event utility (YAHOO.util.Event) when the event was fired.  See
        * <a href="YAHOO.util.Element.html#addListener">Element.addListener</a>
        * for more information on listening for this event.
        * @type YAHOO.util.CustomEvent
        */

        /**
        * @event blur
        * @description Fires when the menu item loses the input focus.  Passes back
        * a single object representing the original DOM event object passed back by
        * the event utility (YAHOO.util.Event) when the event was fired.  See
        * <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for
        * more information on listening for this event.
        * @type YAHOO.util.CustomEvent
        */

        /**
        * @event option
        * @description Fires when the user invokes the button's option.  Passes
        * back a single object representing the original DOM event (either
        * "mousedown" or "keydown") that caused the "option" event to fire.  See
        * <a href="YAHOO.util.Element.html#addListener">Element.addListener</a>
        * for more information on listening for this event.
        * @type YAHOO.util.CustomEvent
        */

    })();

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