/talk2/mathjax/unpacked/MathJax.js

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/*************************************************************
 *
 *  MathJax.js
 *  
 *  The main support code for the MathJax Hub, including the
 *  Ajax, Callback, Messaging, and Object-Oriented Programming
 *  libraries, as well as the base Jax classes, and startup
 *  processing code.
 *  
 *  ---------------------------------------------------------------------
 *  
 *  Copyright (c) 2009-2012 Design Science, Inc.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

if (document.getElementById && document.childNodes && document.createElement) {

if (!window.MathJax) {window.MathJax= {}}
if (!MathJax.Hub) {  // skip if already loaded
  
MathJax.version = "2.1";
MathJax.fileversion = "2.1";

/**********************************************************/

(function (BASENAME) {
  var BASE = window[BASENAME];
  if (!BASE) {BASE = window[BASENAME] = {}}

  var PROTO = [];  // a static object used to indicate when a prototype is being created
  var OBJECT = function (def) {
    var obj = def.constructor; if (!obj) {obj = new Function("")}
    for (var id in def) {if (id !== 'constructor' && def.hasOwnProperty(id)) {obj[id] = def[id]}}
    return obj;
  };
  var CONSTRUCTOR = function () {
    return new Function ("return arguments.callee.Init.call(this,arguments)");
  };
  //
  //  Test for Safari 2.x bug (can't replace prototype for result of new Function()).
  //  (We don't use this version for everyone since it is a closure and we don't need that).
  //
  var BUGTEST = CONSTRUCTOR(); BUGTEST.prototype = {bug_test: 1};
  if (!BUGTEST.prototype.bug_test) {
    CONSTRUCTOR = function () {
      return function () {return arguments.callee.Init.call(this,arguments)};
    };
  };

  BASE.Object = OBJECT({
    constructor: CONSTRUCTOR(),
    
    Subclass: function (def,classdef) {
      var obj = CONSTRUCTOR();
      obj.SUPER = this; obj.Init = this.Init;
      obj.Subclass = this.Subclass; obj.Augment = this.Augment;
      obj.protoFunction = this.protoFunction;
      obj.can = this.can; obj.has = this.has; obj.isa = this.isa;
      obj.prototype = new this(PROTO);
      obj.prototype.constructor = obj;  // the real constructor
      obj.Augment(def,classdef);
      return obj;
    },
  
    Init: function (args) {
      var obj = this;
      if (args.length === 1 && args[0] === PROTO) {return obj}
      if (!(obj instanceof args.callee)) {obj = new args.callee(PROTO)}
      return obj.Init.apply(obj,args) || obj;
    },
    
    Augment: function (def,classdef) {
      var id;
      if (def != null) {
        for (id in def) {if (def.hasOwnProperty(id)) {this.protoFunction(id,def[id])}}
        // MSIE doesn't list toString even if it is not native so handle it separately
        if (def.toString !== this.prototype.toString && def.toString !== {}.toString)
          {this.protoFunction('toString',def.toString)}
      }
      if (classdef != null) {
        for (id in classdef) {if (classdef.hasOwnProperty(id)) {this[id] = classdef[id]}}
      }
      return this;
    },
  
    protoFunction: function (id,def) {
      this.prototype[id] = def;
      if (typeof def === "function") {def.SUPER = this.SUPER.prototype}
    },
  
    prototype: {
      Init: function () {},
      SUPER: function (fn) {return fn.callee.SUPER},
      can: function (method) {return typeof(this[method]) === "function"},
      has: function (property) {return typeof(this[property]) !== "undefined"},
      isa: function (obj) {return (obj instanceof Object) && (this instanceof obj)}
    },
  
    can: function (method)   {return this.prototype.can.call(this,method)},
    has: function (property) {return this.prototype.has.call(this,property)},
    isa: function (obj) {
      var constructor = this;
      while (constructor) {
        if (constructor === obj) {return true} else {constructor = constructor.SUPER}
      }
      return false;
    },


    SimpleSUPER: OBJECT({
      constructor: function (def) {return this.SimpleSUPER.define(def)},

      define: function (src) {
	var dst = {};
	if (src != null) {
          for (var id in src) {if (src.hasOwnProperty(id)) {dst[id] = this.wrap(id,src[id])}}
	  // MSIE doesn't list toString even if it is not native so handle it separately
          if (src.toString !== this.prototype.toString && src.toString !== {}.toString)
            {dst.toString = this.wrap('toString',src.toString)}
	}
	return dst;
      },

      wrap: function (id,f) {
	if (typeof(f) === 'function' && f.toString().match(/\.\s*SUPER\s*\(/)) {
	  var fn = new Function(this.wrapper);
	  fn.label = id; fn.original = f; f = fn;
	  fn.toString = this.stringify;
	}
	return f;
      },

      wrapper: function () {
	var fn = arguments.callee;
	this.SUPER = fn.SUPER[fn.label];
	try {var result = fn.original.apply(this,arguments)}
	  catch (err) {delete this.SUPER; throw err}
	delete this.SUPER;
	return result;
      }.toString().replace(/^\s*function\s*\(\)\s*\{\s*/i,"").replace(/\s*\}\s*$/i,""),

      toString: function () {
	return this.original.toString.apply(this.original,arguments);
      }
    })
  });

})("MathJax");

/**********************************************************/

/*
 *  Create a callback function from various forms of data:
 *  
 *     MathJax.Callback(fn)    -- callback to a function
 *
 *     MathJax.Callback([fn])  -- callback to function
 *     MathJax.Callback([fn,data...])
 *                             -- callback to function with given data as arguments
 *     MathJax.Callback([object,fn])
 *                             -- call fn with object as "this"
 *     MathJax.Callback([object,fn,data...])
 *                             -- call fn with object as "this" and data as arguments
 *     MathJax.Callback(["method",object])
 *                             -- call method of object wth object as "this"
 *     MathJax.Callback(["method",object,data...])
 *                             -- as above, but with data as arguments to method
 *
 *     MathJax.Callback({hook: fn, data: [...], object: this})
 *                             -- give function, data, and object to act as "this" explicitly
 *
 *     MathJax.Callback("code")  -- callback that compiles and executes a string
 *
 *     MathJax.Callback([...],i)
 *                             -- use slice of array starting at i and interpret
 *                                result as above.  (Used for passing "arguments" array
 *                                and trimming initial arguments, if any.)
 */

/*
 *    MathJax.Callback.After([...],cb1,cb2,...)
 *                             -- make a callback that isn't called until all the other
 *                                ones are called first.  I.e., wait for a union of
 *                                callbacks to occur before making the given callback.
 */

/*
 *  MathJax.Callback.Queue([callback,...])
 *                             -- make a synchronized queue of commands that process
 *                                sequentially, waiting for those that return uncalled
 *                                callbacks.
 */

/*
 *  MathJax.Callback.Signal(name)
 *                             -- finds or creates a names signal, to which listeners
 *                                can be attached and are signaled by messages posted
 *                                to the signal.  Responses can be asynchronous.
 */

(function (BASENAME) {
  var BASE = window[BASENAME];
  if (!BASE) {BASE = window[BASENAME] = {}}
  //
  //  Create a callback from an associative array
  //
  var CALLBACK = function (data) {
    var cb = new Function("return arguments.callee.execute.apply(arguments.callee,arguments)");
    for (var id in CALLBACK.prototype) {
      if (CALLBACK.prototype.hasOwnProperty(id)) {
        if (typeof(data[id]) !== 'undefined') {cb[id] = data[id]}
                                         else {cb[id] = CALLBACK.prototype[id]}
      }
    }
    cb.toString = CALLBACK.prototype.toString;
    return cb;
  };
  CALLBACK.prototype = {
    isCallback: true,
    hook: function () {},
    data: [],
    object: window,
    execute: function () {
      if (!this.called || this.autoReset) {
        this.called = !this.autoReset;
        return this.hook.apply(this.object,this.data.concat([].slice.call(arguments,0)));
      }
    },
    reset: function () {delete this.called},
    toString: function () {return this.hook.toString.apply(this.hook,arguments)}
  };
  var ISCALLBACK = function (f) {
    return (typeof(f) === "function" && f.isCallback);
  }
  //
  //  Evaluate a string in global context
  //
  var EVAL = function (code) {return eval.call(window,code)}
  EVAL("var __TeSt_VaR__ = 1"); // check if it works in global context
  if (window.__TeSt_VaR__) {
    try { delete window.__TeSt_VaR__; } // NOTE IE9 throws when in IE7 mode
    catch (error) { window.__TeSt_VaR__ = null; } 
  } else {
    if (window.execScript) {
      // IE
      EVAL = function (code) {
        BASE.__code = code;
        code = "try {"+BASENAME+".__result = eval("+BASENAME+".__code)} catch(err) {"+BASENAME+".__result = err}";
        window.execScript(code);
        var result = BASE.__result; delete BASE.__result; delete BASE.__code;
        if (result instanceof Error) {throw result}
        return result;
      }
    } else {
      // Safari2
      EVAL = function (code) {
        BASE.__code = code;
        code = "try {"+BASENAME+".__result = eval("+BASENAME+".__code)} catch(err) {"+BASENAME+".__result = err}";
        var head = (document.getElementsByTagName("head"))[0]; if (!head) {head = document.body}
        var script = document.createElement("script");
        script.appendChild(document.createTextNode(code));
        head.appendChild(script); head.removeChild(script);
        var result = BASE.__result; delete BASE.__result; delete BASE.__code;
        if (result instanceof Error) {throw result}
        return result;
      }
    }
  }
  //
  //  Create a callback from various types of data
  //
  var USING = function (args,i) {
    if (arguments.length > 1) {
      if (arguments.length === 2 && !(typeof arguments[0] === 'function') &&
          arguments[0] instanceof Object && typeof arguments[1] === 'number')
            {args = [].slice.call(args,i)}
      else {args = [].slice.call(arguments,0)}
    }
    if (args instanceof Array && args.length === 1) {args = args[0]}
    if (typeof args === 'function') {
      if (args.execute === CALLBACK.prototype.execute) {return args}
      return CALLBACK({hook: args});
    } else if (args instanceof Array) {
      if (typeof(args[0]) === 'string' && args[1] instanceof Object &&
                 typeof args[1][args[0]] === 'function') {
        return CALLBACK({hook: args[1][args[0]], object: args[1], data: args.slice(2)});
      } else if (typeof args[0] === 'function') {
        return CALLBACK({hook: args[0], data: args.slice(1)});
      } else if (typeof args[1] === 'function') {
        return CALLBACK({hook: args[1], object: args[0], data: args.slice(2)});
      }
    } else if (typeof(args) === 'string') {
      return CALLBACK({hook: EVAL, data: [args]});
    } else if (args instanceof Object) {
      return CALLBACK(args);
    } else if (typeof(args) === 'undefined') {
      return CALLBACK({});
    }
    throw Error("Can't make callback from given data");
  };
  
  //
  //  Wait for a given time to elapse and then perform the callback
  //
  var DELAY = function (time,callback) {
    callback = USING(callback);
    callback.timeout = setTimeout(callback,time);
    return callback;
  };

  //
  //  Callback used by AFTER, QUEUE, and SIGNAL to check if calls have completed
  //
  var WAITFOR = function (callback,signal) {
    callback = USING(callback);
    if (!callback.called) {WAITSIGNAL(callback,signal); signal.pending++}
  };
  var WAITEXECUTE = function () {
    var signals = this.signal; delete this.signal;
    this.execute = this.oldExecute; delete this.oldExecute;
    var result = this.execute.apply(this,arguments);
    if (ISCALLBACK(result) && !result.called) {WAITSIGNAL(result,signals)} else {
      for (var i = 0, m = signals.length; i < m; i++) {
        signals[i].pending--;
        if (signals[i].pending <= 0) {signals[i].call()}
      }
    }
  };
  var WAITSIGNAL = function (callback,signals) {
    if (!(signals instanceof Array)) {signals = [signals]}
    if (!callback.signal) {
      callback.oldExecute = callback.execute;
      callback.execute = WAITEXECUTE;
      callback.signal = signals;
    } else if (signals.length === 1) {callback.signal.push(signals[0])}
      else {callback.signal = callback.signal.concat(signals)}
  };

  //
  //  Create a callback that is called when a collection of other callbacks have
  //  all been executed.  If the callback gets called immediately (i.e., the
  //  others are all already called), check if it returns another callback
  //  and return that instead.
  //
  var AFTER = function (callback) {
    callback = USING(callback);
    callback.pending = 0;
    for (var i = 1, m = arguments.length; i < m; i++)
      {if (arguments[i]) {WAITFOR(arguments[i],callback)}}
    if (callback.pending === 0) {
      var result = callback();
      if (ISCALLBACK(result)) {callback = result}
    }
    return callback;
  };

  //
  //  An array of prioritized hooks that are executed sequentially
  //  with a given set of data.
  //
  var HOOKS = MathJax.Object.Subclass({
    //
    //  Initialize the array and the auto-reset status
    //
    Init: function (reset) {
      this.hooks = [];
      this.reset = reset;
    },
    //
    //  Add a callback to the list, in priority order (default priority is 10)
    //
    Add: function (hook,priority) {
      if (priority == null) {priority = 10}
      if (!ISCALLBACK(hook)) {hook = USING(hook)}
      hook.priority = priority;
      var i = this.hooks.length;
      while (i > 0 && priority < this.hooks[i-1].priority) {i--}
      this.hooks.splice(i,0,hook);
      return hook;
    },
    Remove: function (hook) {
      for (var i = 0, m = this.hooks.length; i < m; i++) {
        if (this.hooks[i] === hook) {this.hooks.splice(i,1); return}
      }
    },
    //
    //  Execute the list of callbacks, resetting them if requested.
    //  If any return callbacks, return a callback that will be 
    //  executed when they all have completed.
    //
    Execute: function () {
      var callbacks = [{}];
      for (var i = 0, m = this.hooks.length; i < m; i++) {
        if (this.reset) {this.hooks[i].reset()}
        var result = this.hooks[i].apply(window,arguments);
        if (ISCALLBACK(result) && !result.called) {callbacks.push(result)}
      }
      if (callbacks.length === 1) {return null}
      if (callbacks.length === 2) {return callbacks[1]}
      return AFTER.apply({},callbacks);
    }
  });
  
  //
  //  Run an array of callbacks passing them the given data.
  //  (Legacy function, since this has been replaced by the HOOKS object).
  //
  var EXECUTEHOOKS = function (hooks,data,reset) {
    if (!hooks) {return null}
    if (!(hooks instanceof Array)) {hooks = [hooks]}
    if (!(data instanceof Array))  {data = (data == null ? [] : [data])}
    var handler = HOOKS(reset);
    for (var i = 0, m = hooks.length; i < m; i++) {handler.Add(hooks[i])}
    return handler.Execute.apply(handler,data);
  };
   
  //
  //  Command queue that performs commands in order, waiting when
  //  necessary for commands to complete asynchronousely
  //
  var QUEUE = BASE.Object.Subclass({
    //
    //  Create the queue and push any commands that are specified
    //
    Init: function () {
      this.pending = 0; this.running = 0;
      this.queue = [];
      this.Push.apply(this,arguments);
    },
    //
    //  Add commands to the queue and run them. Adding a callback object
    //  (rather than a callback specification) queues a wait for that callback.
    //  Return the final callback for synchronization purposes.
    //
    Push: function () {
      var callback;
      for (var i = 0, m = arguments.length; i < m; i++) {
        callback = USING(arguments[i]);
        if (callback === arguments[i] && !callback.called)
          {callback = USING(["wait",this,callback])}
        this.queue.push(callback);
      }
      if (!this.running && !this.pending) {this.Process()}
      return callback;
    },
    //
    //  Process the command queue if we aren't waiting on another command
    //
    Process: function (queue) {
      while (!this.running && !this.pending && this.queue.length) {
        var callback = this.queue[0];
        queue = this.queue.slice(1); this.queue = [];
        this.Suspend(); var result = callback(); this.Resume();
        if (queue.length) {this.queue = queue.concat(this.queue)}
        if (ISCALLBACK(result) && !result.called) {WAITFOR(result,this)}
      }
    },
    //
    //  Suspend/Resume command processing on this queue
    //
    Suspend: function () {this.running++},
    Resume: function () {if (this.running) {this.running--}},
    //
    //  Used by WAITFOR to restart the queue when an action completes
    //
    call: function () {this.Process.apply(this,arguments)},
    wait: function (callback) {return callback}
  });
  
  //
  //  Create a named signal that listeners can attach to, to be signaled by
  //  postings made to the signal.  Posts are queued if they occur while one
  //  is already in process.
  //
  var SIGNAL = QUEUE.Subclass({
    Init: function (name) {
      QUEUE.prototype.Init.call(this);
      this.name = name;
      this.posted = [];              // the messages posted so far
      this.listeners = HOOKS(true);  // those with interest in this signal
    },
    //
    // Post a message to the signal listeners, with callback for when complete
    //
    Post: function (message,callback,forget) {
      callback = USING(callback);
      if (this.posting || this.pending) {
        this.Push(["Post",this,message,callback,forget]);
      } else {
        this.callback = callback; callback.reset();
        if (!forget) {this.posted.push(message)}
        this.Suspend(); this.posting = true;
        var result = this.listeners.Execute(message);
        if (ISCALLBACK(result) && !result.called) {WAITFOR(result,this)}
        this.Resume(); delete this.posting;
        if (!this.pending) {this.call()}
      }
      return callback;
    },
    //
    //  Clear the post history (so new listeners won't get old messages)
    //
    Clear: function (callback) {
      callback = USING(callback);
      if (this.posting || this.pending) {
        callback = this.Push(["Clear",this,callback]);
      } else {
        this.posted = [];
        callback();
      }
      return callback;
    },
    //
    //  Call the callback (all replies are in) and process the command queue
    //
    call: function () {this.callback(this); this.Process()},
    
    //
    //  A listener calls this to register intrest in the signal (so it will be called
    //  when posts occur).  If ignorePast is true, it will not be sent the post history.
    //
    Interest: function (callback,ignorePast,priority) {
      callback = USING(callback);
      this.listeners.Add(callback,priority);
      if (!ignorePast) {
        for (var i = 0, m = this.posted.length; i < m; i++) {
          callback.reset();
          var result = callback(this.posted[i]);
          if (ISCALLBACK(result) && i === this.posted.length-1) {WAITFOR(result,this)}
        }
      }
      return callback;
    },
    //
    //  A listener calls this to remove itself from a signal
    //
    NoInterest: function (callback) {
      this.listeners.Remove(callback);
    },
    
    //
    //  Hook a callback to a particular message on this signal
    //
    MessageHook: function (msg,callback,priority) {
      callback = USING(callback);
      if (!this.hooks) {this.hooks = {}; this.Interest(["ExecuteHooks",this])}
      if (!this.hooks[msg]) {this.hooks[msg] = HOOKS(true)}
      this.hooks[msg].Add(callback,priority);
      for (var i = 0, m = this.posted.length; i < m; i++)
        {if (this.posted[i] == msg) {callback.reset(); callback(this.posted[i])}}
      return callback;
    },
    //
    //  Execute the message hooks for the given message
    //
    ExecuteHooks: function (msg,more) {
      var type = ((msg instanceof Array) ? msg[0] : msg);
      if (!this.hooks[type]) {return null}
      return this.hooks[type].Execute(msg);
    }
    
  },{
    signals: {},  // the named signals
    find: function (name) {
      if (!SIGNAL.signals[name]) {SIGNAL.signals[name] = new SIGNAL(name)}
      return SIGNAL.signals[name];
    }
  });
  
  //
  //  The main entry-points
  //
  BASE.Callback = BASE.CallBack = USING;
  BASE.Callback.Delay = DELAY;
  BASE.Callback.After = AFTER;
  BASE.Callback.Queue = QUEUE;
  BASE.Callback.Signal = SIGNAL.find;
  BASE.Callback.Hooks = HOOKS;
  BASE.Callback.ExecuteHooks = EXECUTEHOOKS;
})("MathJax");


/**********************************************************/

(function (BASENAME) {
  var BASE = window[BASENAME];
  if (!BASE) {BASE = window[BASENAME] = {}}
  
  var isSafari2 = (navigator.vendor === "Apple Computer, Inc." &&
                   typeof navigator.vendorSub === "undefined");
  var sheets = 0; // used by Safari2

  //
  //  Update sheets count and look up the head object
  //  
  var HEAD = function (head) {
    if (document.styleSheets && document.styleSheets.length > sheets)
      {sheets = document.styleSheets.length}
    if (!head) {
      head = (document.getElementsByTagName("head"))[0];
      if (!head) {head = document.body}
    }
    return head;
  };
  
  //
  //  Remove scripts that are completed so they don't clutter up the HEAD.
  //  This runs via setTimeout since IE7 can't remove the script while it is running.
  //
  var SCRIPTS = [];  // stores scripts to be removed after a delay
  var REMOVESCRIPTS = function () {
    for (var i = 0, m = SCRIPTS.length; i < m; i++) {BASE.Ajax.head.removeChild(SCRIPTS[i])}
    SCRIPTS = [];
  };
  
  BASE.Ajax = {
    loaded: {},         // files already loaded
    loading: {},        // files currently in process of loading
    loadHooks: {},      // hooks to call when files are loaded
    timeout: 15*1000,   // timeout for loading of files (15 seconds)
    styleDelay: 1,      // delay to use before styles are available
    config: {root: ""}, // URL of root directory to load from

    STATUS: {
      OK: 1,         // file is loading or did load OK
      ERROR: -1      // file timed out during load
    },
    
    rootPattern: new RegExp("^\\["+BASENAME+"\\]"),
    
    //
    //  Return a complete URL to a file (replacing the root pattern)
    //
    fileURL: function (file) {return file.replace(this.rootPattern,this.config.root)},
    
    //
    //  Load a file if it hasn't been already.
    //  Make sure the file URL is "safe"?
    //
    Require: function (file,callback) {
      callback = BASE.Callback(callback); var type;
      if (file instanceof Object) {for (var i in file) {}; type = i.toUpperCase(); file = file[i]}
        else {type = file.split(/\./).pop().toUpperCase()}
      file = this.fileURL(file);
      // FIXME: check that URL is OK
      if (this.loaded[file]) {
        callback(this.loaded[file]);
      } else {
        var FILE = {}; FILE[type] = file;
        this.Load(FILE,callback);
      }
      return callback;
    },

    //
    //  Load a file regardless of where it is and whether it has
    //  already been loaded.
    //
    Load: function (file,callback) {
      callback = BASE.Callback(callback); var type;
      if (file instanceof Object) {for (var i in file) {}; type = i.toUpperCase(); file = file[i]}
        else {type = file.split(/\./).pop().toUpperCase()}
      file = this.fileURL(file);
      if (this.loading[file]) {
        this.addHook(file,callback);
      } else {
        this.head = HEAD(this.head);
        if (this.loader[type]) {this.loader[type].call(this,file,callback)}
         else {throw Error("Can't load files of type "+type)}
      }
      return callback;
    },
    
    //
    //  Register a load hook for a particular file (it will be called when
    //  loadComplete() is called for that file)
    //
    LoadHook: function (file,callback,priority) {
      callback = BASE.Callback(callback);
      if (file instanceof Object) {for (var i in file) {file = file[i]}}
      file = this.fileURL(file);
      if (this.loaded[file]) {callback(this.loaded[file])}
        else {this.addHook(file,callback,priority)}
      return callback;
    },
    addHook: function (file,callback,priority) {
      if (!this.loadHooks[file]) {this.loadHooks[file] = MathJax.Callback.Hooks()}
      this.loadHooks[file].Add(callback,priority);
    },
    
    //
    //  Used when files are combined in a preloading configuration file
    //
    Preloading: function () {
      for (var i = 0, m = arguments.length; i < m; i++) {
        var file = this.fileURL(arguments[i]);
        if (!this.loading[file]) {this.loading[file] = {preloaded: true}}
      }
    },
    
    //
    //  Code used to load the various types of files
    //  (JS for JavaScript, CSS for style sheets)
    //
    loader: {
      //
      //  Create a SCRIPT tag to load the file
      //
      JS: function (file,callback) {
        var script = document.createElement("script");
        var timeout = BASE.Callback(["loadTimeout",this,file]);
        this.loading[file] = {
          callback: callback,
          message: BASE.Message.File(file),
          timeout: setTimeout(timeout,this.timeout),
          status: this.STATUS.OK,
          script: script
        };
        script.onerror = timeout;  // doesn't work in IE and no apparent substitute
        script.type = "text/javascript";
        script.src = file;
        this.head.appendChild(script);
      },
      //
      //  Create a LINK tag to load the style sheet
      //
      CSS: function (file,callback) {
        var link = document.createElement("link");
        link.rel = "stylesheet"; link.type = "text/css"; link.href = file;
        this.loading[file] = {
          callback: callback,
          message: BASE.Message.File(file),
          status: this.STATUS.OK
        };
        this.head.appendChild(link);
        this.timer.create.call(this,[this.timer.file,file],link);
      }
    },
    
    //
    //  Timing code for checking when style sheets are available.
    //
    timer: {
      //
      //  Create the timing callback and start the timing loop.
      //  We use a delay because some browsers need it to allow the styles
      //  to be processed.
      //
      create: function (callback,node) {
        callback = BASE.Callback(callback);
        if (node.nodeName === "STYLE" && node.styleSheet &&
            typeof(node.styleSheet.cssText) !== 'undefined') {
          callback(this.STATUS.OK); // MSIE processes style immediately, but doesn't set its styleSheet!
        } else if (window.chrome && typeof(window.sessionStorage) !== "undefined" &&
                   node.nodeName === "STYLE") {
          callback(this.STATUS.OK); // Same for Chrome 5 (beta), Grrr.
        } else if (isSafari2) {
          this.timer.start(this,[this.timer.checkSafari2,sheets++,callback],this.styleDelay);
        } else {
          this.timer.start(this,[this.timer.checkLength,node,callback],this.styleDelay);
        }
        return callback;
      },
      //
      //  Start the timer for the given callback checker
      //
      start: function (AJAX,check,delay,timeout) {
        check = BASE.Callback(check);
        check.execute = this.execute; check.time = this.time;
        check.STATUS = AJAX.STATUS; check.timeout = timeout || AJAX.timeout;
        check.delay = check.total = 0;
        if (delay) {setTimeout(check,delay)} else {check()}
      },
      //
      //  Increment the time total, increase the delay
      //  and test if we are past the timeout time.
      //  
      time: function (callback) {
        this.total += this.delay;
        this.delay = Math.floor(this.delay * 1.05 + 5);
        if (this.total >= this.timeout) {callback(this.STATUS.ERROR); return 1}
        return 0;
      },
      //
      //  For JS file loads, call the proper routine according to status
      //
      file: function (file,status) {
        if (status < 0) {BASE.Ajax.loadTimeout(file)} else {BASE.Ajax.loadComplete(file)}
      },
      //
      //  Call the hook with the required data
      //
      execute: function () {this.hook.call(this.object,this,this.data[0],this.data[1])},
      //
      //  Safari2 doesn't set the link's stylesheet, so we need to look in the
      //  document.styleSheets array for the new sheet when it is created
      //
      checkSafari2: function (check,length,callback) {
        if (check.time(callback)) return;
        if (document.styleSheets.length > length &&
            document.styleSheets[length].cssRules &&
            document.styleSheets[length].cssRules.length)
          {callback(check.STATUS.OK)} else {setTimeout(check,check.delay)}
      },
      //
      //  Look for the stylesheets rules and check when they are defined
      //  and no longer of length zero.  (This assumes there actually ARE
      //  some rules in the stylesheet.)
      //  
      checkLength: function (check,node,callback) {
        if (check.time(callback)) return;
        var isStyle = 0; var sheet = (node.sheet || node.styleSheet);
        try {if ((sheet.cssRules||sheet.rules||[]).length > 0) {isStyle = 1}} catch(err) {
          if (err.message.match(/protected variable|restricted URI/)) {isStyle = 1}
          else if (err.message.match(/Security error/)) {
            // Firefox3 gives "Security error" for missing files, so
            //   can't distinguish that from OK files on remote servers.
            //   or OK files in different directory from local files.
            isStyle = 1; // just say it is OK (can't really tell)
          }
        }
        if (isStyle) {
          // Opera 9.6 requires this setTimeout
          setTimeout(BASE.Callback([callback,check.STATUS.OK]),0);
        } else {
          setTimeout(check,check.delay);
        }
      }
    },

    //
    //  JavaScript code must call this when they are completely initialized
    //  (this allows them to perform asynchronous actions before indicating
    //  that they are complete).
    //
    loadComplete: function (file) {
      file = this.fileURL(file);
      var loading = this.loading[file];
      if (loading && !loading.preloaded) {
        BASE.Message.Clear(loading.message);
        clearTimeout(loading.timeout);
	if (loading.script) {
	  if (SCRIPTS.length === 0) {setTimeout(REMOVESCRIPTS,0)}
	  SCRIPTS.push(loading.script);
	}
        this.loaded[file] = loading.status; delete this.loading[file];
        this.addHook(file,loading.callback);
      } else {
        if (loading) {delete this.loading[file]}
        this.loaded[file] = this.STATUS.OK;
        loading = {status: this.STATUS.OK}
      }
      if (!this.loadHooks[file]) {return null}
      return this.loadHooks[file].Execute(loading.status);
    },
    
    //
    //  If a file fails to load within the timeout period (or the onerror handler
    //  is called), this routine runs to signal the error condition.
    //  
    loadTimeout: function (file) {
      if (this.loading[file].timeout) {clearTimeout(this.loading[file].timeout)}
      this.loading[file].status = this.STATUS.ERROR;
      this.loadError(file);
      this.loadComplete(file);
    },
    
    //
    //  The default error hook for file load failures
    //
    loadError: function (file) {
      BASE.Message.Set("File failed to load: "+file,null,2000);
      BASE.Hub.signal.Post(["file load error",file]);
    },

    //
    //  Defines a style sheet from a hash of style declarations (key:value pairs
    //  where the key is the style selector and the value is a hash of CSS attributes 
    //  and values).
    //
    Styles: function (styles,callback) {
      var styleString = this.StyleString(styles);
      if (styleString === "") {
        callback = BASE.Callback(callback);
        callback();
      } else {
        var style = document.createElement("style"); style.type = "text/css";
        this.head = HEAD(this.head);
        this.head.appendChild(style);
        if (style.styleSheet && typeof(style.styleSheet.cssText) !== 'undefined') {
          style.styleSheet.cssText = styleString;
        } else {
          style.appendChild(document.createTextNode(styleString));
        }
        callback = this.timer.create.call(this,callback,style);
      }
      return callback;
    },
    
    //
    //  Create a stylesheet string from a style declaration object
    //
    StyleString: function (styles) {
      if (typeof(styles) === 'string') {return styles}
      var string = "", id, style;
      for (id in styles) {if (styles.hasOwnProperty(id)) {
        if (typeof styles[id] === 'string') {
          string += id + " {"+styles[id]+"}\n";
        } else if (styles[id] instanceof Array) {
          for (var i = 0; i < styles[id].length; i++) {
            style = {}; style[id] = styles[id][i];
            string += this.StyleString(style);
          }
        } else if (id.substr(0,6) === '@media') {
          string += id + " {"+this.StyleString(styles[id])+"}\n";
        } else if (styles[id] != null) {
          style = [];
          for (var name in styles[id]) {if (styles[id].hasOwnProperty(name)) {
            if (styles[id][name] != null) 
              {style[style.length] = name + ': ' + styles[id][name]}
          }}
          string += id +" {"+style.join('; ')+"}\n";
        }
      }}
      return string;
    }
  };

})("MathJax");

/**********************************************************/

MathJax.HTML = {
  //
  //  Create an HTML element with given attributes and content.
  //  The def parameter is an (optional) object containing key:value pairs
  //  of the attributes and their values, and contents is an (optional)
  //  array of strings to be inserted as text, or arrays of the form
  //  [type,def,contents] that describes an HTML element to be inserted
  //  into the current element.  Thus the contents can describe a complete
  //  HTML snippet of arbitrary complexity.  E.g.:
  //  
  //    MathJax.HTML.Element("span",{id:"mySpan",style{"font-style":"italic"}},[
  //        "(See the ",["a",{href:"http://www.mathjax.org"},["MathJax home page"]],
  //        " for more details.)"]);
  // 
  Element: function (type,def,contents) {
    var obj = document.createElement(type);
    if (def) {
      if (def.style) {
        var style = def.style; def.style = {};
        for (var id in style) {if (style.hasOwnProperty(id))
          {def.style[id.replace(/-([a-z])/g,this.ucMatch)] = style[id]}}
      }
      MathJax.Hub.Insert(obj,def);
    }
    if (contents) {
      if (!(contents instanceof Array)) {contents = [contents]}
      for (var i = 0; i < contents.length; i++) {
        if (contents[i] instanceof Array) {
          obj.appendChild(this.Element(contents[i][0],contents[i][1],contents[i][2]));
        } else {
          obj.appendChild(document.createTextNode(contents[i]));
        }
      }
    }
    return obj;
  },
  ucMatch: function (match,c) {return c.toUpperCase()},
  addElement: function (span,type,def,contents) {return span.appendChild(this.Element(type,def,contents))},
  TextNode: function (text) {return document.createTextNode(text)},
  addText: function (span,text) {return span.appendChild(this.TextNode(text))},

  //
  //  Set and get the text of a script
  //
  setScript: function (script,text) {
    if (this.setScriptBug) {script.text = text} else {
      while (script.firstChild) {script.removeChild(script.firstChild)}
      this.addText(script,text);
    }
  },
  getScript: function (script) {
    var text = (script.text === "" ? script.innerHTML : script.text);
    return text.replace(/^\s+/,"").replace(/\s+$/,"");
  },

  //
  //  Manage cookies
  //
  Cookie: {
    prefix: "mjx",
    expires: 365,
    
    //
    //  Save an object as a named cookie
    //
    Set: function (name,def) {
      var keys = [];
      if (def) {
        for (var id in def) {if (def.hasOwnProperty(id)) {
          keys.push(id+":"+def[id].toString().replace(/&/g,"&&"));
        }}
      }
      var cookie = this.prefix+"."+name+"="+escape(keys.join('&;'));
      if (this.expires) {
        var time = new Date(); time.setDate(time.getDate() + this.expires);
        cookie += '; expires='+time.toGMTString();
      }
      document.cookie = cookie+"; path=/";
    },
    
    //
    //  Get the contents of a named cookie and incorporate
    //  it into the given object (or return a fresh one)
    //
    Get: function (name,obj) {
      if (!obj) {obj = {}}
      var pattern = new RegExp("(?:^|;\\s*)"+this.prefix+"\\."+name+"=([^;]*)(?:;|$)");
      var match = pattern.exec(document.cookie);
      if (match && match[1] !== "") {
        var keys = unescape(match[1]).split('&;');
        for (var i = 0, m = keys.length; i < m; i++) {
          match = keys[i].match(/([^:]+):(.*)/);
          var value = match[2].replace(/&&/g,'&');
          if (value === "true") {value = true} else if (value === "false") {value = false}
            else if (value.match(/^-?(\d+(\.\d+)?|\.\d+)$/)) {value = parseFloat(value)}
          obj[match[1]] = value;
        }
      }
      return obj;
    }
  }
    
};


/**********************************************************/

MathJax.Message = {
  ready: false,  // used to tell when the styles are available
  log: [{}], current: null,
  textNodeBug: (navigator.vendor === "Apple Computer, Inc." &&
                typeof navigator.vendorSub === "undefined") ||
               (window.hasOwnProperty && window.hasOwnProperty("konqueror")), // Konqueror displays some gibberish with text.nodeValue = "..."
  
  styles: {
    "#MathJax_Message": {
      position: "fixed", left: "1px", bottom: "2px",
      'background-color': "#E6E6E6",  border: "1px solid #959595",
      margin: "0px", padding: "2px 8px",
      'z-index': "102", color: "black", 'font-size': "80%",
      width: "auto", 'white-space': "nowrap"
    },
    
    "#MathJax_MSIE_Frame": {
      position: "absolute",
      top:0, left: 0, width: "0px", 'z-index': 101,
      border: "0px", margin: "0px", padding: "0px"
    }
  },
  
  browsers: {
    MSIE: function (browser) {
      MathJax.Hub.config.styles["#MathJax_Message"].position = "absolute";
      MathJax.Message.quirks = (document.compatMode === "BackCompat");
    },
    Chrome: function (browser) {
      MathJax.Hub.config.styles["#MathJax_Message"].bottom = "1.5em";
      MathJax.Hub.config.styles["#MathJax_Message"].left = "1em";
    }
  },
  
  Init: function (styles) {
    if (styles) {this.ready = true}
    if (!document.body || !this.ready) {return false}
    //
    //  ASCIIMathML replaces the entire page with a copy of itself (@#!#%@!!)
    //  so check that this.div is still part of the page, otherwise look up
    //  the copy and use that.
    //
    if (this.div && this.div.parentNode == null) {
      this.div = document.getElementById("MathJax_Message");
      if (this.div) {this.text = this.div.firstChild}
    }
    if (!this.div) {
      var frame = document.body;
      if (MathJax.Hub.Browser.isMSIE) {
	  frame = this.frame = this.addDiv(document.body); frame.removeAttribute("id");
        frame.style.position = "absolute";
        frame.style.border = frame.style.margin = frame.style.padding = "0px";
        frame.style.zIndex = "101"; frame.style.height = "0px";
        frame = this.addDiv(frame);
        frame.id = "MathJax_MSIE_Frame";
        window.attachEvent("onscroll",this.MoveFrame);
        window.attachEvent("onresize",this.MoveFrame);
        this.MoveFrame();
      }
      this.div = this.addDiv(frame); this.div.style.display = "none";
      this.text = this.div.appendChild(document.createTextNode(""));
    }
    return true;
  },
  
  addDiv: function (parent) {
    var div = document.createElement("div");
    div.id = "MathJax_Message";
    if (parent.firstChild) {parent.insertBefore(div,parent.firstChild)}
      else {parent.appendChild(div)}
    return div;
  },
  
  MoveFrame: function () {
    var body = (MathJax.Message.quirks ? document.body : document.documentElement);
    var frame = MathJax.Message.frame;
    frame.style.left = body.scrollLeft + 'px';
    frame.style.top = body.scrollTop + 'px';
    frame.style.width = body.clientWidth + 'px';
    frame = frame.firstChild;
    frame.style.height = body.clientHeight + 'px';
  },
  
  filterText: function (text,n) {
    if (MathJax.Hub.config.messageStyle === "simple") {
      if (text.match(/^Loading /)) {
        if (!this.loading) {this.loading = "Loading "}
        text = this.loading; this.loading += ".";
      } else if (text.match(/^Processing /)) {
        if (!this.processing) {this.processing = "Processing "}
        text = this.processing; this.processing += ".";
      } else if (text.match(/^Typesetting /)) {
        if (!this.typesetting) {this.typesetting = "Typesetting "}
        text = this.typesetting; this.typesetting += ".";
      }
    }
    return text;
  },
  
  Set: function (text,n,clearDelay) {
    if (this.timer) {clearTimeout(this.timer); delete this.timeout}
    if (n == null) {n = this.log.length; this.log[n] = {}}
    this.log[n].text = text; this.log[n].filteredText = text = this.filterText(text,n);
    if (typeof(this.log[n].next) === "undefined") {
      this.log[n].next = this.current;
      if (this.current != null) {this.log[this.current].prev = n}
      this.current = n;
    }
    if (this.current === n && MathJax.Hub.config.messageStyle !== "none") {
      if (this.Init()) {
        if (this.textNodeBug) {this.div.innerHTML = text} else {this.text.nodeValue = text}
        this.div.style.display = "";
        if (this.status) {window.status = ""; delete this.status}
      } else {
        window.status = text;
        this.status = true;
      }
    }
    if (clearDelay) {setTimeout(MathJax.Callback(["Clear",this,n]),clearDelay)}
    else if (clearDelay == 0) {this.Clear(n,0)}
    return n;
  },
  
  Clear: function (n,delay) {
    if (this.log[n].prev != null) {this.log[this.log[n].prev].next = this.log[n].next}
    if (this.log[n].next != null) {this.log[this.log[n].next].prev = this.log[n].prev}
    if (this.current === n) {
      this.current = this.log[n].next;
      if (this.text) {
        if (this.div.parentNode == null) {this.Init()} // see ASCIIMathML comments above
        if (this.current == null) {
	if (this.timer) {clearTimeout(this.timer); delete this.timer}
          if (delay == null) {delay = 600}
          if (delay === 0) {this.Remove()}
	    else {this.timer = setTimeout(MathJax.Callback(["Remove",this]),delay)}
        } else if (MathJax.Hub.config.messageStyle !== "none") {
          if (this.textNodeBug) {this.div.innerHTML = this.log[this.current].filteredText}
                           else {this.text.nodeValue = this.log[this.current].filteredText}
        }
        if (this.status) {window.status = ""; delete this.status}
      } else if (this.status) {
        window.status = (this.current == null ? "" : this.log[this.current].text);
      }
    }
    delete this.log[n].next; delete this.log[n].prev;
    delete this.log[n].filteredText;
  },
  
  Remove: function () {
    // FIXME:  do a fade out or something else interesting?
    this.text.nodeValue = "";
    this.div.style.display = "none";
  },
  
  File: function (file) {
    var root = MathJax.Ajax.config.root;
    if (file.substr(0,root.length) === root) {file = "[MathJax]"+file.substr(root.length)}
    return this.Set("Loading "+file);
  },
  
  Log: function () {
    var strings = [];
    for (var i = 1, m = this.log.length; i < m; i++) {strings[i] = this.log[i].text}
    return strings.join("\n");
  }

};

/**********************************************************/

MathJax.Hub = {
  config: {
    root: "",
    config: [],      // list of configuration files to load
    styleSheets: [], // list of CSS files to load
    styles: {        // styles to generate in-line
      ".MathJax_Preview": {color: "#888"}
    },
    jax: [],         // list of input and output jax to load
    extensions: [],  // list of extensions to load
    preJax: null,    // pattern to remove from before math script tag
    postJax: null,   // pattern to remove from after math script tag
    displayAlign: 'center',       // how to align displayed equations (left, center, right)
    displayIndent: '0',           // indentation for displayed equations (when not centered)
    preRemoveClass: 'MathJax_Preview', // class of objects to remove preceeding math script
    showProcessingMessages: true, // display "Processing math: nn%" messages or not
    messageStyle: "normal",       // set to "none" or "simple" (for "Loading..." and "Processing...")
    delayStartupUntil: "none",    // set to "onload" to delay setup until the onload handler runs
                                  // set to "configured" to delay startup until MathJax.Hub.Configured() is called
                                  // set to a Callback to wait for before continuing with the startup
    skipStartupTypeset: false,    // set to true to skip PreProcess and Process during startup
    "v1.0-compatible": true,  // set to false to prevent message about configuration change
    elements: [],             // array of elements to process when none is given explicitly
    positionToHash: true,    // after initial typeset pass, position to #hash location?
     
    showMathMenu: true,      // attach math context menu to typeset math?
    showMathMenuMSIE: true,  // separtely determine if MSIE should have math menu
                             //  (since the code for that is a bit delicate)

    menuSettings: {
      zoom: "None",        //  when to do MathZoom
      CTRL: false,         //    require CTRL for MathZoom?
      ALT: false,          //    require Alt or Option?
      CMD: false,          //    require CMD?
      Shift: false,        //    require Shift?
      discoverable: false, //  make math menu discoverable on hover?
      zscale: "200%",      //  the scaling factor for MathZoom
      renderer: "",        //  set when Jax are loaded
      font: "Auto",        //  what font HTML-CSS should use
      context: "MathJax",  //  or "Browser" for pass-through to browser menu
      mpContext: false,    //  true means pass menu events to MathPlayer in IE
      mpMouse: false,      //  true means pass mouse events to MathPlayer in IE
      texHints: true       //  include class names for TeXAtom elements
    },
    
    errorSettings: {
      message: ["[Math Processing Error]"], // HTML snippet structure for message to use
      style: {color: "#CC0000", "font-style":"italic"}  // style for message
    }
  },
  
  preProcessors: MathJax.Callback.Hooks(true), // list of callbacks for preprocessing (initialized by extensions)
  inputJax: {},          // mime-type mapped to input jax (by registration)
  outputJax: {order:{}}, // mime-type mapped to output jax list (by registration)

  processUpdateTime: 250, // time between screen updates when processing math (milliseconds)
  processUpdateDelay: 10, // pause between screen updates to allow other processing (milliseconds)

  signal: MathJax.Callback.Signal("Hub"), // Signal used for Hub events

  Config: function (def) {
    this.Insert(this.config,def);
    if (this.config.Augment) {this.Augment(this.config.Augment)}
  },
  CombineConfig: function (name,def) {
    var config = this.config, id, parent; name = name.split(/\./);
    for (var i = 0, m = name.length; i < m; i++) {
      id = name[i]; if (!config[id]) {config[id] = {}}
      parent = config; config = config[id];
    }
    parent[id] = config = this.Insert(def,config);
    return config;
  },
  
  Register: {
    PreProcessor: function () {MathJax.Hub.preProcessors.Add.apply(MathJax.Hub.preProcessors,arguments)},
    MessageHook: function () {return MathJax.Hub.signal.MessageHook.apply(MathJax.Hub.signal,arguments)},
    StartupHook: function () {return MathJax.Hub.Startup.signal.MessageHook.apply(MathJax.Hub.Startup.signal,arguments)},
    LoadHook: function () {return MathJax.Ajax.LoadHook.apply(MathJax.Ajax,arguments)}
  },
  
  getAllJax: function (element) {
    var jax = [], scripts = this.elementScripts(element);
    for (var i = 0, m = scripts.length; i < m; i++) {
      if (scripts[i].MathJax && scripts[i].MathJax.elementJax)
        {jax.push(scripts[i].MathJax.elementJax)}
    }
    return jax;
  },
  
  getJaxByType: function (type,element) {
    var jax = [], scripts = this.elementScripts(element);
    for (var i = 0, m = scripts.length; i < m; i++) {
      if (scripts[i].MathJax && scripts[i].MathJax.elementJax &&
          scripts[i].MathJax.elementJax.mimeType === type)
            {jax.push(scripts[i].MathJax.elementJax)}
    }
    return jax;
  },
  
  getJaxByInputType: function (type,element) {
    var jax = [], scripts = this.elementScripts(element);
    for (var i = 0, m = scripts.length; i < m; i++) {
      if (scripts[i].MathJax && scripts[i].MathJax.elementJax &&
          scripts[i].type && scripts[i].type.replace(/ *;(.|\s)*/,"") === type)
        {jax.push(scripts[i].MathJax.elementJax)}
    }
    return jax;
  }…