/*
Copyright (c) 2008, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.5.1
*/
/**
 * The YAHOO object is the single global object used by YUI Library.  It
 * contains utility function for setting up namespaces, inheritance, and
 * logging.  YAHOO.util, YAHOO.widget, and YAHOO.example are namespaces
 * created automatically for and used by the library.
 * @module yahoo
 * @title  YAHOO Global
 */

/**
 * YAHOO_config is not included as part of the library.  Instead it is an 
 * object that can be defined by the implementer immediately before 
 * including the YUI library.  The properties included in this object
 * will be used to configure global properties needed as soon as the 
 * library begins to load.
 * @class YAHOO_config
 * @static
 */

/**
 * A reference to a function that will be executed every time a YAHOO module
 * is loaded.  As parameter, this function will receive the version
 * information for the module. See <a href="YAHOO.env.html#getVersion">
 * YAHOO.env.getVersion</a> for the description of the version data structure.
 * @property listener
 * @type Function
 * @static
 * @default undefined
 */

/**
 * Set to true if the library will be dynamically loaded after window.onload.
 * Defaults to false 
 * @property injecting
 * @type boolean
 * @static
 * @default undefined
 */

/**
 * Instructs the yuiloader component to dynamically load yui components and
 * their dependencies.  See the yuiloader documentation for more information
 * about dynamic loading
 * @property load
 * @static
 * @default undefined
 * @see yuiloader
 */

/**
 * Forces the use of the supplied locale where applicable in the library
 * @property locale
 * @type string
 * @static
 * @default undefined
 */

if (typeof YAHOO == "undefined" || !YAHOO) {
    /**
     * The YAHOO global namespace object.  If YAHOO is already defined, the
     * existing YAHOO object will not be overwritten so that defined
     * namespaces are preserved.
     * @class YAHOO
     * @static
     */
    var YAHOO = {};
}

/**
 * Returns the namespace specified and creates it if it doesn't exist
 * <pre>
 * YAHOO.namespace("property.package");
 * YAHOO.namespace("YAHOO.property.package");
 * </pre>
 * Either of the above would create YAHOO.property, then
 * YAHOO.property.package
 *
 * Be careful when naming packages. Reserved words may work in some browsers
 * and not others. For instance, the following will fail in Safari:
 * <pre>
 * YAHOO.namespace("really.long.nested.namespace");
 * </pre>
 * This fails because "long" is a future reserved word in ECMAScript
 *
 * @method namespace
 * @static
 * @param  {String*} arguments 1-n namespaces to create 
 * @return {Object}  A reference to the last namespace object created
 */
YAHOO.namespace = function() {
    var a=arguments, o=null, i, j, d;
    for (i=0; i<a.length; i=i+1) {
        d=a[i].split(".");
        o=YAHOO;

        // YAHOO is implied, so it is ignored if it is included
        for (j=(d[0] == "YAHOO") ? 1 : 0; j<d.length; j=j+1) {
            o[d[j]]=o[d[j]] || {};
            o=o[d[j]];
        }
    }

    return o;
};

/**
 * Uses YAHOO.widget.Logger to output a log message, if the widget is
 * available.
 *
 * @method log
 * @static
 * @param  {String}  msg  The message to log.
 * @param  {String}  cat  The log category for the message.  Default
 *                        categories are "info", "warn", "error", time".
 *                        Custom categories can be used as well. (opt)
 * @param  {String}  src  The source of the the message (opt)
 * @return {Boolean}      True if the log operation was successful.
 */
YAHOO.log = function(msg, cat, src) {
    var l=YAHOO.widget.Logger;
    if(l && l.log) {
        return l.log(msg, cat, src);
    } else {
        return false;
    }
};

/**
 * Registers a module with the YAHOO object
 * @method register
 * @static
 * @param {String}   name    the name of the module (event, slider, etc)
 * @param {Function} mainClass a reference to class in the module.  This
 *                             class will be tagged with the version info
 *                             so that it will be possible to identify the
 *                             version that is in use when multiple versions
 *                             have loaded
 * @param {Object}   data      metadata object for the module.  Currently it
 *                             is expected to contain a "version" property
 *                             and a "build" property at minimum.
 */
YAHOO.register = function(name, mainClass, data) {
    var mods = YAHOO.env.modules;
    if (!mods[name]) {
        mods[name] = { versions:[], builds:[] };
    }
    var m=mods[name],v=data.version,b=data.build,ls=YAHOO.env.listeners;
    m.name = name;
    m.version = v;
    m.build = b;
    m.versions.push(v);
    m.builds.push(b);
    m.mainClass = mainClass;
    // fire the module load listeners
    for (var i=0;i<ls.length;i=i+1) {
        ls[i](m);
    }
    // label the main class
    if (mainClass) {
        mainClass.VERSION = v;
        mainClass.BUILD = b;
    } else {
        YAHOO.log("mainClass is undefined for module " + name, "warn");
    }
};

/**
 * YAHOO.env is used to keep track of what is known about the YUI library and
 * the browsing environment
 * @class YAHOO.env
 * @static
 */
YAHOO.env = YAHOO.env || {

    /**
     * Keeps the version info for all YUI modules that have reported themselves
     * @property modules
     * @type Object[]
     */
    modules: [],
    
    /**
     * List of functions that should be executed every time a YUI module
     * reports itself.
     * @property listeners
     * @type Function[]
     */
    listeners: []
};

/**
 * Returns the version data for the specified module:
 *      <dl>
 *      <dt>name:</dt>      <dd>The name of the module</dd>
 *      <dt>version:</dt>   <dd>The version in use</dd>
 *      <dt>build:</dt>     <dd>The build number in use</dd>
 *      <dt>versions:</dt>  <dd>All versions that were registered</dd>
 *      <dt>builds:</dt>    <dd>All builds that were registered.</dd>
 *      <dt>mainClass:</dt> <dd>An object that was was stamped with the
 *                 current version and build. If 
 *                 mainClass.VERSION != version or mainClass.BUILD != build,
 *                 multiple versions of pieces of the library have been
 *                 loaded, potentially causing issues.</dd>
 *       </dl>
 *
 * @method getVersion
 * @static
 * @param {String}  name the name of the module (event, slider, etc)
 * @return {Object} The version info
 */
YAHOO.env.getVersion = function(name) {
    return YAHOO.env.modules[name] || null;
};

/**
 * Do not fork for a browser if it can be avoided.  Use feature detection when
 * you can.  Use the user agent as a last resort.  YAHOO.env.ua stores a version
 * number for the browser engine, 0 otherwise.  This value may or may not map
 * to the version number of the browser using the engine.  The value is 
 * presented as a float so that it can easily be used for boolean evaluation 
 * as well as for looking for a particular range of versions.  Because of this, 
 * some of the granularity of the version info may be lost (e.g., Gecko 1.8.0.9 
 * reports 1.8).
 * @class YAHOO.env.ua
 * @static
 */
YAHOO.env.ua = function() {
    var o={

        /**
         * Internet Explorer version number or 0.  Example: 6
         * @property ie
         * @type float
         */
        ie:0,

        /**
         * Opera version number or 0.  Example: 9.2
         * @property opera
         * @type float
         */
        opera:0,

        /**
         * Gecko engine revision number.  Will evaluate to 1 if Gecko 
         * is detected but the revision could not be found. Other browsers
         * will be 0.  Example: 1.8
         * <pre>
         * Firefox 1.0.0.4: 1.7.8   <-- Reports 1.7
         * Firefox 1.5.0.9: 1.8.0.9 <-- Reports 1.8
         * Firefox 2.0.0.3: 1.8.1.3 <-- Reports 1.8
         * Firefox 3 alpha: 1.9a4   <-- Reports 1.9
         * </pre>
         * @property gecko
         * @type float
         */
        gecko:0,

        /**
         * AppleWebKit version.  KHTML browsers that are not WebKit browsers 
         * will evaluate to 1, other browsers 0.  Example: 418.9.1
         * <pre>
         * Safari 1.3.2 (312.6): 312.8.1 <-- Reports 312.8 -- currently the 
         *                                   latest available for Mac OSX 10.3.
         * Safari 2.0.2:         416     <-- hasOwnProperty introduced
         * Safari 2.0.4:         418     <-- preventDefault fixed
         * Safari 2.0.4 (419.3): 418.9.1 <-- One version of Safari may run
         *                                   different versions of webkit
         * Safari 2.0.4 (419.3): 419     <-- Tiger installations that have been
         *                                   updated, but not updated
         *                                   to the latest patch.
         * Webkit 212 nightly:   522+    <-- Safari 3.0 precursor (with native SVG
         *                                   and many major issues fixed).  
         * 3.x yahoo.com, flickr:422     <-- Safari 3.x hacks the user agent
         *                                   string when hitting yahoo.com and 
         *                                   flickr.com.
         * Safari 3.0.4 (523.12):523.12  <-- First Tiger release - automatic update
         *                                   from 2.x via the 10.4.11 OS patch
         * Webkit nightly 1/2008:525+    <-- Supports DOMContentLoaded event.
         *                                   yahoo.com user agent hack removed.
         *                                   
         * </pre>
         * http://developer.apple.com/internet/safari/uamatrix.html
         * @property webkit
         * @type float
         */
        webkit: 0,

        /**
         * The mobile property will be set to a string containing any relevant
         * user agent information when a modern mobile browser is detected.
         * Currently limited to Safari on the iPhone/iPod Touch, Nokia N-series
         * devices with the WebKit-based browser, and Opera Mini.  
         * @property mobile 
         * @type string
         */
        mobile: null,

        /**
         * Adobe AIR version number or 0.  Only populated if webkit is detected.
         * Example: 1.0
         * @property air
         * @type float
         */
        air: 0

    };

    var ua=navigator.userAgent, m;

    // Modern KHTML browsers should qualify as Safari X-Grade
    if ((/KHTML/).test(ua)) {
        o.webkit=1;
    }
    // Modern WebKit browsers are at least X-Grade
    m=ua.match(/AppleWebKit\/([^\s]*)/);
    if (m&&m[1]) {
        o.webkit=parseFloat(m[1]);

        // Mobile browser check
        if (/ Mobile\//.test(ua)) {
            o.mobile = "Apple"; // iPhone or iPod Touch
        } else {
            m=ua.match(/NokiaN[^\/]*/);
            if (m) {
                o.mobile = m[0]; // Nokia N-series, ex: NokiaN95
            }
        }

        m=ua.match(/AdobeAIR\/([^\s]*)/);
        if (m) {
            o.air = m[0]; // Adobe AIR 1.0 or better
        }

    }

    if (!o.webkit) { // not webkit
        // @todo check Opera/8.01 (J2ME/MIDP; Opera Mini/2.0.4509/1316; fi; U; ssr)
        m=ua.match(/Opera[\s\/]([^\s]*)/);
        if (m&&m[1]) {
            o.opera=parseFloat(m[1]);
            m=ua.match(/Opera Mini[^;]*/);
            if (m) {
                o.mobile = m[0]; // ex: Opera Mini/2.0.4509/1316
            }
        } else { // not opera or webkit
            m=ua.match(/MSIE\s([^;]*)/);
            if (m&&m[1]) {
                o.ie=parseFloat(m[1]);
            } else { // not opera, webkit, or ie
                m=ua.match(/Gecko\/([^\s]*)/);
                if (m) {
                    o.gecko=1; // Gecko detected, look for revision
                    m=ua.match(/rv:([^\s\)]*)/);
                    if (m&&m[1]) {
                        o.gecko=parseFloat(m[1]);
                    }
                }
            }
        }
    }
    
    return o;
}();

/*
 * Initializes the global by creating the default namespaces and applying
 * any new configuration information that is detected.  This is the setup
 * for env.
 * @method init
 * @static
 * @private
 */
(function() {
    YAHOO.namespace("util", "widget", "example");
    if ("undefined" !== typeof YAHOO_config) {
        var l=YAHOO_config.listener,ls=YAHOO.env.listeners,unique=true,i;
        if (l) {
            // if YAHOO is loaded multiple times we need to check to see if
            // this is a new config object.  If it is, add the new component
            // load listener to the stack
            for (i=0;i<ls.length;i=i+1) {
                if (ls[i]==l) {
                    unique=false;
                    break;
                }
            }
            if (unique) {
                ls.push(l);
            }
        }
    }
})();
/**
 * Provides the language utilites and extensions used by the library
 * @class YAHOO.lang
 */
YAHOO.lang = YAHOO.lang || {
    /**
     * Determines whether or not the provided object is an array.
     * Testing typeof/instanceof/constructor of arrays across frame 
     * boundaries isn't possible in Safari unless you have a reference
     * to the other frame to test against its Array prototype.  To
     * handle this case, we test well-known array properties instead.
     * properties.
     * @method isArray
     * @param {any} o The object being testing
     * @return {boolean} the result
     */
    isArray: function(o) { 
        if (o) {
           var l = YAHOO.lang;
           return l.isNumber(o.length) && l.isFunction(o.splice);
        }
        return false;
    },

    /**
     * Determines whether or not the provided object is a boolean
     * @method isBoolean
     * @param {any} o The object being testing
     * @return {boolean} the result
     */
    isBoolean: function(o) {
        return typeof o === 'boolean';
    },
    
    /**
     * Determines whether or not the provided object is a function
     * @method isFunction
     * @param {any} o The object being testing
     * @return {boolean} the result
     */
    isFunction: function(o) {
        return typeof o === 'function';
    },
        
    /**
     * Determines whether or not the provided object is null
     * @method isNull
     * @param {any} o The object being testing
     * @return {boolean} the result
     */
    isNull: function(o) {
        return o === null;
    },
        
    /**
     * Determines whether or not the provided object is a legal number
     * @method isNumber
     * @param {any} o The object being testing
     * @return {boolean} the result
     */
    isNumber: function(o) {
        return typeof o === 'number' && isFinite(o);
    },
      
    /**
     * Determines whether or not the provided object is of type object
     * or function
     * @method isObject
     * @param {any} o The object being testing
     * @return {boolean} the result
     */  
    isObject: function(o) {
return (o && (typeof o === 'object' || YAHOO.lang.isFunction(o))) || false;
    },
        
    /**
     * Determines whether or not the provided object is a string
     * @method isString
     * @param {any} o The object being testing
     * @return {boolean} the result
     */
    isString: function(o) {
        return typeof o === 'string';
    },
        
    /**
     * Determines whether or not the provided object is undefined
     * @method isUndefined
     * @param {any} o The object being testing
     * @return {boolean} the result
     */
    isUndefined: function(o) {
        return typeof o === 'undefined';
    },
    
    /**
     * Determines whether or not the property was added
     * to the object instance.  Returns false if the property is not present
     * in the object, or was inherited from the prototype.
     * This abstraction is provided to enable hasOwnProperty for Safari 1.3.x.
     * There is a discrepancy between YAHOO.lang.hasOwnProperty and
     * Object.prototype.hasOwnProperty when the property is a primitive added to
     * both the instance AND prototype with the same value:
     * <pre>
     * var A = function() {};
     * A.prototype.foo = 'foo';
     * var a = new A();
     * a.foo = 'foo';
     * alert(a.hasOwnProperty('foo')); // true
     * alert(YAHOO.lang.hasOwnProperty(a, 'foo')); // false when using fallback
     * </pre>
     * @method hasOwnProperty
     * @param {any} o The object being testing
     * @return {boolean} the result
     */
    hasOwnProperty: function(o, prop) {
        if (Object.prototype.hasOwnProperty) {
            return o.hasOwnProperty(prop);
        }
        
        return !YAHOO.lang.isUndefined(o[prop]) && 
                o.constructor.prototype[prop] !== o[prop];
    },
 
    /**
     * IE will not enumerate native functions in a derived object even if the
     * function was overridden.  This is a workaround for specific functions 
     * we care about on the Object prototype. 
     * @property _IEEnumFix
     * @param {Function} r  the object to receive the augmentation
     * @param {Function} s  the object that supplies the properties to augment
     * @static
     * @private
     */
    _IEEnumFix: function(r, s) {
        if (YAHOO.env.ua.ie) {
            var add=["toString", "valueOf"], i;
            for (i=0;i<add.length;i=i+1) {
                var fname=add[i],f=s[fname];
                if (YAHOO.lang.isFunction(f) && f!=Object.prototype[fname]) {
                    r[fname]=f;
                }
            }
        }
    },
       
    /**
     * Utility to set up the prototype, constructor and superclass properties to
     * support an inheritance strategy that can chain constructors and methods.
     * Static members will not be inherited.
     *
     * @method extend
     * @static
     * @param {Function} subc   the object to modify
     * @param {Function} superc the object to inherit
     * @param {Object} overrides  additional properties/methods to add to the
     *                              subclass prototype.  These will override the
     *                              matching items obtained from the superclass 
     *                              if present.
     */
    extend: function(subc, superc, overrides) {
        if (!superc||!subc) {
            throw new Error("YAHOO.lang.extend failed, please check that " +
                            "all dependencies are included.");
        }
        var F = function() {};
        F.prototype=superc.prototype;
        subc.prototype=new F();
        subc.prototype.constructor=subc;
        subc.superclass=superc.prototype;
        if (superc.prototype.constructor == Object.prototype.constructor) {
            superc.prototype.constructor=superc;
        }
    
        if (overrides) {
            for (var i in overrides) {
                subc.prototype[i]=overrides[i];
            }

            YAHOO.lang._IEEnumFix(subc.prototype, overrides);
        }
    },
   
    /**
     * Applies all properties in the supplier to the receiver if the
     * receiver does not have these properties yet.  Optionally, one or 
     * more methods/properties can be specified (as additional 
     * parameters).  This option will overwrite the property if receiver 
     * has it already.  If true is passed as the third parameter, all 
     * properties will be applied and _will_ overwrite properties in 
     * the receiver.
     *
     * @method augmentObject
     * @static
     * @since 2.3.0
     * @param {Function} r  the object to receive the augmentation
     * @param {Function} s  the object that supplies the properties to augment
     * @param {String*|boolean}  arguments zero or more properties methods 
     *        to augment the receiver with.  If none specified, everything
     *        in the supplier will be used unless it would
     *        overwrite an existing property in the receiver. If true
     *        is specified as the third parameter, all properties will
     *        be applied and will overwrite an existing property in
     *        the receiver
     */
    augmentObject: function(r, s) {
        if (!s||!r) {
            throw new Error("Absorb failed, verify dependencies.");
        }
        var a=arguments, i, p, override=a[2];
        if (override && override!==true) { // only absorb the specified properties
            for (i=2; i<a.length; i=i+1) {
                r[a[i]] = s[a[i]];
            }
        } else { // take everything, overwriting only if the third parameter is true
            for (p in s) { 
                if (override || !r[p]) {
                    r[p] = s[p];
                }
            }
            
            YAHOO.lang._IEEnumFix(r, s);
        }
    },
 
    /**
     * Same as YAHOO.lang.augmentObject, except it only applies prototype properties
     * @see YAHOO.lang.augmentObject
     * @method augmentProto
     * @static
     * @param {Function} r  the object to receive the augmentation
     * @param {Function} s  the object that supplies the properties to augment
     * @param {String*|boolean}  arguments zero or more properties methods 
     *        to augment the receiver with.  If none specified, everything 
     *        in the supplier will be used unless it would overwrite an existing 
     *        property in the receiver.  if true is specified as the third 
     *        parameter, all properties will be applied and will overwrite an 
     *        existing property in the receiver
     */
    augmentProto: function(r, s) {
        if (!s||!r) {
            throw new Error("Augment failed, verify dependencies.");
        }
        //var a=[].concat(arguments);
        var a=[r.prototype,s.prototype];
        for (var i=2;i<arguments.length;i=i+1) {
            a.push(arguments[i]);
        }
        YAHOO.lang.augmentObject.apply(this, a);
    },

      
    /**
     * Returns a simple string representation of the object or array.
     * Other types of objects will be returned unprocessed.  Arrays
     * are expected to be indexed.  Use object notation for
     * associative arrays.
     * @method dump
     * @since 2.3.0
     * @param o {Object} The object to dump
     * @param d {int} How deep to recurse child objects, default 3
     * @return {String} the dump result
     */
    dump: function(o, d) {
        var l=YAHOO.lang,i,len,s=[],OBJ="{...}",FUN="f(){...}",
            COMMA=', ', ARROW=' => ';

        // Cast non-objects to string
        // Skip dates because the std toString is what we want
        // Skip HTMLElement-like objects because trying to dump 
        // an element will cause an unhandled exception in FF 2.x
        if (!l.isObject(o)) {
            return o + "";
        } else if (o instanceof Date || ("nodeType" in o && "tagName" in o)) {
            return o;
        } else if  (l.isFunction(o)) {
            return FUN;
        }

        // dig into child objects the depth specifed. Default 3
        d = (l.isNumber(d)) ? d : 3;

        // arrays [1, 2, 3]
        if (l.isArray(o)) {
            s.push("[");
            for (i=0,len=o.length;i<len;i=i+1) {
                if (l.isObject(o[i])) {
                    s.push((d > 0) ? l.dump(o[i], d-1) : OBJ);
                } else {
                    s.push(o[i]);
                }
                s.push(COMMA);
            }
            if (s.length > 1) {
                s.pop();
            }
            s.push("]");
        // objects {k1 => v1, k2 => v2}
        } else {
            s.push("{");
            for (i in o) {
                if (l.hasOwnProperty(o, i)) {
                    s.push(i + ARROW);
                    if (l.isObject(o[i])) {
                        s.push((d > 0) ? l.dump(o[i], d-1) : OBJ);
                    } else {
                        s.push(o[i]);
                    }
                    s.push(COMMA);
                }
            }
            if (s.length > 1) {
                s.pop();
            }
            s.push("}");
        }

        return s.join("");
    },

    /**
     * Does variable substitution on a string. It scans through the string 
     * looking for expressions enclosed in { } braces. If an expression 
     * is found, it is used a key on the object.  If there is a space in
     * the key, the first word is used for the key and the rest is provided
     * to an optional function to be used to programatically determine the
     * value (the extra information might be used for this decision). If 
     * the value for the key in the object, or what is returned from the
     * function has a string value, number value, or object value, it is 
     * substituted for the bracket expression and it repeats.  If this
     * value is an object, it uses the Object's toString() if this has
     * been overridden, otherwise it does a shallow dump of the key/value
     * pairs.
     * @method substitute
     * @since 2.3.0
     * @param s {String} The string that will be modified.
     * @param o {Object} An object containing the replacement values
     * @param f {Function} An optional function that can be used to
     *                     process each match.  It receives the key,
     *                     value, and any extra metadata included with
     *                     the key inside of the braces.
     * @return {String} the substituted string
     */
    substitute: function (s, o, f) {
        var i, j, k, key, v, meta, l=YAHOO.lang, saved=[], token, 
            DUMP='dump', SPACE=' ', LBRACE='{', RBRACE='}';


        for (;;) {
            i = s.lastIndexOf(LBRACE);
            if (i < 0) {
                break;
            }
            j = s.indexOf(RBRACE, i);
            if (i + 1 >= j) {
                break;
            }

            //Extract key and meta info 
            token = s.substring(i + 1, j);
            key = token;
            meta = null;
            k = key.indexOf(SPACE);
            if (k > -1) {
                meta = key.substring(k + 1);
                key = key.substring(0, k);
            }

            // lookup the value
            v = o[key];

            // if a substitution function was provided, execute it
            if (f) {
                v = f(key, v, meta);
            }

            if (l.isObject(v)) {
                if (l.isArray(v)) {
                    v = l.dump(v, parseInt(meta, 10));
                } else {
                    meta = meta || "";

                    // look for the keyword 'dump', if found force obj dump
                    var dump = meta.indexOf(DUMP);
                    if (dump > -1) {
                        meta = meta.substring(4);
                    }

                    // use the toString if it is not the Object toString 
                    // and the 'dump' meta info was not found
                    if (v.toString===Object.prototype.toString||dump>-1) {
                        v = l.dump(v, parseInt(meta, 10));
                    } else {
                        v = v.toString();
                    }
                }
            } else if (!l.isString(v) && !l.isNumber(v)) {
                // This {block} has no replace string. Save it for later.
                v = "~-" + saved.length + "-~";
                saved[saved.length] = token;

                // break;
            }

            s = s.substring(0, i) + v + s.substring(j + 1);


        }

        // restore saved {block}s
        for (i=saved.length-1; i>=0; i=i-1) {
            s = s.replace(new RegExp("~-" + i + "-~"), "{"  + saved[i] + "}", "g");
        }

        return s;
    },


    /**
     * Returns a string without any leading or trailing whitespace.  If 
     * the input is not a string, the input will be returned untouched.
     * @method trim
     * @since 2.3.0
     * @param s {string} the string to trim
     * @return {string} the trimmed string
     */
    trim: function(s){
        try {
            return s.replace(/^\s+|\s+$/g, "");
        } catch(e) {
            return s;
        }
    },

    /**
     * Returns a new object containing all of the properties of
     * all the supplied objects.  The properties from later objects
     * will overwrite those in earlier objects.
     * @method merge
     * @since 2.3.0
     * @param arguments {Object*} the objects to merge
     * @return the new merged object
     */
    merge: function() {
        var o={}, a=arguments;
        for (var i=0, l=a.length; i<l; i=i+1) {
            YAHOO.lang.augmentObject(o, a[i], true);
        }
        return o;
    },

    /**
     * Executes the supplied function in the context of the supplied 
     * object 'when' milliseconds later.  Executes the function a 
     * single time unless periodic is set to true.
     * @method later
     * @since 2.4.0
     * @param when {int} the number of milliseconds to wait until the fn 
     * is executed
     * @param o the context object
     * @param fn {Function|String} the function to execute or the name of 
     * the method in the 'o' object to execute
     * @param data [Array] data that is provided to the function.  This accepts
     * either a single item or an array.  If an array is provided, the
     * function is executed with one parameter for each array item.  If
     * you need to pass a single array parameter, it needs to be wrapped in
     * an array [myarray]
     * @param periodic {boolean} if true, executes continuously at supplied 
     * interval until canceled
     * @return a timer object. Call the cancel() method on this object to 
     * stop the timer.
     */
    later: function(when, o, fn, data, periodic) {
        when = when || 0; 
        o = o || {};
        var m=fn, d=data, f, r;

        if (YAHOO.lang.isString(fn)) {
            m = o[fn];
        }

        if (!m) {
            throw new TypeError("method undefined");
        }

        if (!YAHOO.lang.isArray(d)) {
            d = [data];
        }

        f = function() {
            m.apply(o, d);
        };

        r = (periodic) ? setInterval(f, when) : setTimeout(f, when);

        return {
            interval: periodic,
            cancel: function() {
                if (this.interval) {
                    clearInterval(r);
                } else {
                    clearTimeout(r);
                }
            }
        };
    },
    
    /**
     * A convenience method for detecting a legitimate non-null value.
     * Returns false for null/undefined/NaN, true for other values, 
     * including 0/false/''
     * @method isValue
     * @since 2.3.0
     * @param o {any} the item to test
     * @return {boolean} true if it is not null/undefined/NaN || false
     */
    isValue: function(o) {
        // return (o || o === false || o === 0 || o === ''); // Infinity fails
        var l = YAHOO.lang;
return (l.isObject(o) || l.isString(o) || l.isNumber(o) || l.isBoolean(o));
    }

};

/*
 * An alias for <a href="YAHOO.lang.html">YAHOO.lang</a>
 * @class YAHOO.util.Lang
 */
YAHOO.util.Lang = YAHOO.lang;
 
/**
 * Same as YAHOO.lang.augmentObject, except it only applies prototype 
 * properties.  This is an alias for augmentProto.
 * @see YAHOO.lang.augmentObject
 * @method augment
 * @static
 * @param {Function} r  the object to receive the augmentation
 * @param {Function} s  the object that supplies the properties to augment
 * @param {String*|boolean}  arguments zero or more properties methods to 
 *        augment the receiver with.  If none specified, everything
 *        in the supplier will be used unless it would
 *        overwrite an existing property in the receiver.  if true
 *        is specified as the third parameter, all properties will
 *        be applied and will overwrite an existing property in
 *        the receiver
 */
YAHOO.lang.augment = YAHOO.lang.augmentProto;

/**
 * An alias for <a href="YAHOO.lang.html#augment">YAHOO.lang.augment</a>
 * @for YAHOO
 * @method augment
 * @static
 * @param {Function} r  the object to receive the augmentation
 * @param {Function} s  the object that supplies the properties to augment
 * @param {String*}  arguments zero or more properties methods to 
 *        augment the receiver with.  If none specified, everything
 *        in the supplier will be used unless it would
 *        overwrite an existing property in the receiver
 */
YAHOO.augment = YAHOO.lang.augmentProto;
       
/**
 * An alias for <a href="YAHOO.lang.html#extend">YAHOO.lang.extend</a>
 * @method extend
 * @static
 * @param {Function} subc   the object to modify
 * @param {Function} superc the object to inherit
 * @param {Object} overrides  additional properties/methods to add to the
 *        subclass prototype.  These will override the
 *        matching items obtained from the superclass if present.
 */
YAHOO.extend = YAHOO.lang.extend;

YAHOO.register("yahoo", YAHOO, {version: "2.5.1", build: "984"});