ftConnect =
{
  /**
   * @description Array of MSFT ActiveX ids for XMLHttpRequest.
   * @property _msxml_progid
   * @private
   * @static
   * @type array
   */
	_msxml_progid:[
		'MSXML2.XMLHTTP.3.0',
		'MSXML2.XMLHTTP',
		'Microsoft.XMLHTTP'
		],

  /**
   * @description Object literal of HTTP header(s)
   * @property _http_header
   * @private
   * @static
   * @type object
   */
	_http_headers:{},

  /**
   * @description Determines if HTTP headers are set.
   * @property _has_http_headers
   * @private
   * @static
   * @type boolean
   */
	_has_http_headers:false,


 /**
  * @description Determines if a default header of
  * 'X-Requested-With: XMLHttpRequest'
  * will be added to each transaction.
  * @property _use_default_xhr_header
  * @private
  * @static
  * @type boolean
  */
    _use_default_xhr_header:true,

 /**
  * @description The default header value for the label
  * "X-Requested-With".  This is sent with each
  * transaction, by default, to identify the
  * request as being made by YUI Connection Manager.
  * @property _default_xhr_header
  * @private
  * @static
  * @type boolean
  */
    _default_xhr_header:'XMLHttpRequest',

 /**
  * @description Determines if custom, default headers
  * are set for each transaction.
  * @property _has_default_header
  * @private
  * @static
  * @type boolean
  */
    _has_default_headers:true,

 /**
  * @description Determines if custom, default headers
  * are set for each transaction.
  * @property _has_default_header
  * @private
  * @static
  * @type boolean
  */
    _default_headers:{},

 /**
  * @description Collection of polling references to the polling mechanism in handleReadyState.
  * @property _poll
  * @private
  * @static
  * @type object
  */
    _poll:{},

 /**
  * @description Queue of timeout values for each transaction callback with a defined timeout value.
  * @property _timeOut
  * @private
  * @static
  * @type object
  */
    _timeOut:{},

  /**
   * @description The polling frequency, in milliseconds, for HandleReadyState.
   * when attempting to determine a transaction's XHR readyState.
   * The default is 50 milliseconds.
   * @property _polling_interval
   * @private
   * @static
   * @type int
   */
     _polling_interval:50,

  /**
   * @description A transaction counter that increments the transaction id for each transaction.
   * @property _transaction_id
   * @private
   * @static
   * @type int
   */
     _transaction_id:0,


  /**
   * @description Member to add an ActiveX id to the existing xml_progid array.
   * In the event(unlikely) a new ActiveX id is introduced, it can be added
   * without internal code modifications.
   * @method setProgId
   * @public
   * @static
   * @param {string} id The ActiveX id to be added to initialize the XHR object.
   * @return void
   */
	setProgId:function(id)
	{
		this._msxml_progid.unshift(id);
	},


  /**
   * @description Member to enable or disable the default POST header.
   * @method setDefaultXhrHeader
   * @public
   * @static
   * @param {boolean} b Set and use default header - true or false .
   * @return void
   */
	setDefaultXhrHeader:function(b)
	{
		this._use_default_xhr_header = b;
	},

  /**
   * @description Member to modify the default polling interval.
   * @method setPollingInterval
   * @public
   * @static
   * @param {int} i The polling interval in milliseconds.
   * @return void
   */
	setPollingInterval:function(i)
	{
		if(typeof i == 'number' && isFinite(i)){
			this._polling_interval = i;
		}
	},

  /**
   * @description Instantiates a XMLHttpRequest object and returns an object with two properties:
   * the XMLHttpRequest instance and the transaction id.
   * @method createXhrObject
   * @private
   * @static
   * @param {int} transactionId Property containing the transaction id for this transaction.
   * @return object
   */
	createXhrObject:function(transactionId)
	{
		var obj,http;
		try
		{
			// Instantiates XMLHttpRequest in non-IE browsers and assigns to http.
			http = new XMLHttpRequest();
			//  Object literal with http and tId properties
			obj = { conn:http, tId:transactionId };
		}
		catch(e)
		{
			for(var i=0; i<this._msxml_progid.length; ++i){
				try
				{
					// Instantiates XMLHttpRequest for IE and assign to http.
					http = new ActiveXObject(this._msxml_progid[i]);
					//  Object literal with conn and tId properties
					obj = { conn:http, tId:transactionId };
					break;
				}
				catch(e){}
			}
		}
		finally
		{
			return obj;
		}
	},

  /**
   * @description This method is called by asyncRequest to create a
   * valid connection object for the transaction.  It also passes a
   * transaction id and increments the transaction id counter.
   * @method getConnectionObject
   * @private
   * @static
   * @return {object}
   */
	getConnectionObject:function()
	{
		var o;
		var tId = this._transaction_id;

		try
		{
			o = this.createXhrObject(tId);
			if(o){
				this._transaction_id++;
			}
		}
		catch(e){}
		finally
		{
			return o;
		}
	},

  /**
   * @description Method for initiating an asynchronous request via the XHR object.
   * @method asyncRequest
   * @public
   * @static
   * @param {string} method HTTP transaction method
   * @param {string} uri Fully qualified path of resource
   * @param {callback} callback User-defined callback function or object
   * @return {object} Returns the connection object
   */
	asyncRequest:function(method, uri, callback)
	{
		var o = this.getConnectionObject();

		if(!o){
			return null;
		}
		else{

			o.conn.open(method, uri, true);

			if(this._use_default_xhr_header){
				if(!this._default_headers['X-Requested-With']){
					this.initHeader('X-Requested-With', this._default_xhr_header, true);
				}
			}

			if(this._has_default_headers || this._has_http_headers){
				this.setHeader(o);
			}

			this.handleReadyState(o, callback);
			o.conn.send(null);

			return o;
		}
	},

  /**
   * @description This method serves as a timer that polls the XHR object's readyState
   * property during a transaction, instead of binding a callback to the
   * onreadystatechange event.  Upon readyState 4, handleTransactionResponse
   * will process the response, and the timer will be cleared.
   * @method handleReadyState
   * @private
   * @static
   * @param {object} o The connection object
   * @param {callback} callback The user-defined callback object
   * @return {void}
   */
    handleReadyState:function(o, callback)
    {
		var oConn = this;

		if(callback && callback.timeout){
			this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
		}

		this._poll[o.tId] = window.setInterval(
			function(){
				if(o.conn && o.conn.readyState === 4){
					window.clearInterval(oConn._poll[o.tId]);
					delete oConn._poll[o.tId];

					if(callback && callback.timeout){
						delete oConn._timeOut[o.tId];
					}

					oConn.handleTransactionResponse(o, callback);
				}
			}
		,this._polling_interval);
    },

  /**
   * @description This method attempts to interpret the server response and
   * determine whether the transaction was successful, or if an error or
   * exception was encountered.
   * @method handleTransactionResponse
   * @private
   * @static
   * @param {object} o The connection object
   * @param {object} callback The sser-defined callback object
   * @param {boolean} isAbort Determines if the transaction was aborted.
   * @return {void}
   */
    handleTransactionResponse:function(o, callback, isAbort)
    {
		// If no valid callback is provided, then do not process any callback handling.
		if(!callback){
			this.releaseObject(o);
			return;
		}

		var httpStatus, responseObject;

		try
		{
			if(o.conn.status !== undefined && o.conn.status !== 0){
				httpStatus = o.conn.status;
			}
			else{
				httpStatus = 13030;
			}
		}
		catch(e){

			 // 13030 is the custom code to indicate the condition -- in Mozilla/FF --
			 // when the o object's status and statusText properties are
			 // unavailable, and a query attempt throws an exception.
			httpStatus = 13030;
		}

		if(httpStatus >= 200 && httpStatus < 300 || httpStatus === 1223){
			responseObject = this.createResponseObject(o, callback.argument);
			if(callback.success){
				if(!callback.scope){
					callback.success(responseObject);
				}
				else{
					// If a scope property is defined, the callback will be fired from
					// the context of the object.
					callback.success.apply(callback.scope, [responseObject]);
				}
			}
		}
		else{
			switch(httpStatus){
				// The following cases are wininet.dll error codes that may be encountered.
				case 12002: // Server timeout
				case 12029: // 12029 to 12031 correspond to dropped connections.
				case 12030:
				case 12031:
				case 12152: // Connection closed by server.
				case 13030: // See above comments for variable status.
					responseObject = this.createExceptionObject(o.tId, callback.argument, (isAbort?isAbort:false));
					if(callback.failure){
						if(!callback.scope){
							callback.failure(responseObject);
						}
						else{
							callback.failure.apply(callback.scope, [responseObject]);
						}
					}
					break;
				default:
					responseObject = this.createResponseObject(o, callback.argument);
					if(callback.failure){
						if(!callback.scope){
							callback.failure(responseObject);
						}
						else{
							callback.failure.apply(callback.scope, [responseObject]);
						}
					}
			}
		}

		this.releaseObject(o);
		responseObject = null;
    },

  /**
   * @description This method evaluates the server response, creates and returns the results via
   * its properties.  Success and failure cases will differ in the response
   * object's property values.
   * @method createResponseObject
   * @private
   * @static
   * @param {object} o The connection object
   * @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
   * @return {object}
   */
    createResponseObject:function(o, callbackArg)
    {
		var obj = {};
		var headerObj = {};

		try
		{
			var headerStr = o.conn.getAllResponseHeaders();
			var header = headerStr.split('\n');
			for(var i=0; i<header.length; i++){
				var delimitPos = header[i].indexOf(':');
				if(delimitPos != -1){
					headerObj[header[i].substring(0,delimitPos)] = header[i].substring(delimitPos+2);
				}
			}
		}
		catch(e){}

		obj.tId = o.tId;
		// Normalize IE's response to HTTP 204 when Win error 1223.
		obj.status = (o.conn.status == 1223)?204:o.conn.status;
		// Normalize IE's statusText to "No Content" instead of "Unknown".
		obj.statusText = (o.conn.status == 1223)?"No Content":o.conn.statusText;
		obj.getResponseHeader = headerObj;
		obj.getAllResponseHeaders = headerStr;
		obj.responseText = o.conn.responseText;
		obj.responseXML = o.conn.responseXML;

		if(typeof callbackArg !== undefined){
			obj.argument = callbackArg;
		}

		return obj;
    },

  /**
   * @description If a transaction cannot be completed due to dropped or closed connections,
   * there may be not be enough information to build a full response object.
   * The failure callback will be fired and this specific condition can be identified
   * by a status property value of 0.
   *
   * If an abort was successful, the status property will report a value of -1.
   *
   * @method createExceptionObject
   * @private
   * @static
   * @param {int} tId The Transaction Id
   * @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
   * @param {boolean} isAbort Determines if the exception case is caused by a transaction abort
   * @return {object}
   */
    createExceptionObject:function(tId, callbackArg, isAbort)
    {
		var COMM_CODE = 0;
		var COMM_ERROR = 'communication failure';
		var ABORT_CODE = -1;
		var ABORT_ERROR = 'transaction aborted';

		var obj = {};

		obj.tId = tId;
		if(isAbort){
			obj.status = ABORT_CODE;
			obj.statusText = ABORT_ERROR;
		}
		else{
			obj.status = COMM_CODE;
			obj.statusText = COMM_ERROR;
		}

		if(callbackArg){
			obj.argument = callbackArg;
		}

		return obj;
    },

  /**
   * @description Method that initializes the custom HTTP headers for the each transaction.
   * @method initHeader
   * @public
   * @static
   * @param {string} label The HTTP header label
   * @param {string} value The HTTP header value
   * @param {string} isDefault Determines if the specific header is a default header
   * automatically sent with each transaction.
   * @return {void}
   */
	initHeader:function(label,value,isDefault)
	{
		var headerObj = (isDefault)?this._default_headers:this._http_headers;

		if(headerObj[label] === undefined){
			headerObj[label] = value;
		}
		else{
			// Concatenate multiple values, comma-delimited,
			// for the same header label,
			headerObj[label] =  value + "," + headerObj[label];
		}

		if(isDefault){
			this._has_default_headers = true;
		}
		else{
			this._has_http_headers = true;
		}
	},


    /**
     * Determines whether or not the provided object is undefined
     * @method isUndefined
     * @param {any} obj The object being testing
     * @return Boolean
     */
    isUndefined: function(obj) {
        return typeof obj == '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} obj The object being testing
     * @return Boolean
     */
    hasOwnProperty: function(obj, prop) {
        if (Object.prototype.hasOwnProperty) {
            return obj.hasOwnProperty(prop);
        }
        
        return !this.isUndefined(obj[prop]) && 
                obj.constructor.prototype[prop] !== obj[prop];
    },


  /**
   * @description Accessor that sets the HTTP headers for each transaction.
   * @method setHeader
   * @private
   * @static
   * @param {object} o The connection object for the transaction.
   * @return {void}
   */
	setHeader:function(o)
	{
		if(this._has_default_headers){
			for(var prop in this._default_headers){
				if(this.hasOwnProperty(this._default_headers,prop)){
					o.conn.setRequestHeader(prop, this._default_headers[prop]);
				}
			}
		}

		if(this._has_http_headers){
			for(var prop in this._http_headers){
				if(this.hasOwnProperty(this._http_headers,prop)){
					o.conn.setRequestHeader(prop, this._http_headers[prop]);
				}
			}
			delete this._http_headers;

			this._http_headers = {};
			this._has_http_headers = false;
		}
	},

  /**
   * @description Resets the default HTTP headers object
   * @method resetDefaultHeaders
   * @public
   * @static
   * @return {void}
   */
	resetDefaultHeaders:function(){
		delete this._default_headers
		this._default_headers = {};
		this._has_default_headers = false;
	},



  /**
   * @description Method to terminate a transaction, if it has not reached readyState 4.
   * @method abort
   * @public
   * @static
   * @param {object} o The connection object returned by asyncRequest.
   * @param {object} callback  User-defined callback object.
   * @param {string} isTimeout boolean to indicate if abort was a timeout.
   * @return {boolean}
   */
	abort:function(o, callback, isTimeout)
	{
		if(this.isCallInProgress(o)){
			o.conn.abort();
			window.clearInterval(this._poll[o.tId]);
			delete this._poll[o.tId];
			if(isTimeout){
				delete this._timeOut[o.tId];
			}

			this.handleTransactionResponse(o, callback, true);

			return true;
		}
		else{
			return false;
		}
	},

  /**
   * Public method to check if the transaction is still being processed.
   *
   * @method isCallInProgress
   * @public
   * @static
   * @param {object} o The connection object returned by asyncRequest
   * @return {boolean}
   */
	isCallInProgress:function(o)
	{
		// if the XHR object assigned to the transaction has not been dereferenced,
		// then check its readyState status.  Otherwise, return false.
		if(o.conn){
			return o.conn.readyState !== 4 && o.conn.readyState !== 0;
		}
		else{
			//The XHR object has been destroyed.
			return false;
		}
	},

  /**
   * @description Dereference the XHR instance and the connection object after the transaction is completed.
   * @method releaseObject
   * @private
   * @static
   * @param {object} o The connection object
   * @return {void}
   */
	releaseObject:function(o)
	{
		//dereference the XHR instance.
		o.conn = null;
		//dereference the connection object.
		o = null;
	}
};



function ft_ping() {
	this.pingInterval = 60000;
	this.pingStarted = false;
	this.timerHandle = null;
  this.callbackPing =  {
	  success:handlePingSuccess,
  	failure:handlePingFailure
  };	
	return(this);
}

ft_ping.prototype.startPing = function() {
	this.pingStarted = true;
	this.setTimer(this);
}

ft_ping.prototype.stopPing = function() {
	this.pingStarted = false;
	if (this.timerHandle != null) {
		clearTimeout(this.timerHandle);
		this.timerHandle = null;
	}
}

ft_ping.prototype.setTimer = function(obj) {
	var thisC = obj;
	obj.timerHandle = setTimeout(function() {thisC.doPing()}, obj.pingInterval);
}

ft_ping.prototype.contextTimedOut = function() {
	window.location = "/";
}

var handlePingSuccess = function(o) {
	if (o.responseText == "Context updated") {
	  if (o.argument.pingStarted) o.argument.setTimer(o.argument);
		return;
	}
	
	if (o.responseText == "Context timed out") {
    o.argument.contextTimedOut();		
		return;
	}
}

var handlePingFailure = function(o) {
  o.argument.contextTimedOut();
}


ft_ping.prototype.doPing = function() {
  var url = "/ftweb/bin/ft.dll/ping";
	this.callbackPing.argument = this;
	var request = ftConnect.asyncRequest('GET', url, this.callbackPing);	
}

function browserSupportsPing() {
	var retval = false;
	if (useragent.isie) retval = true;
	if (useragent.isfirefox) retval = true;
	if (useragent.issafari) retval = true;
	if (useragent.isopera) retval = true;
	
	if (retval) {
		try {
  		var conobj = ftConnect.getConnectionObject();
			retval = conobj != null;
		} catch(e) {
			retval = false;
		}
	}
	return retval;
}

var ping = new ft_ping();