function sack(file) {

    this.AjaxFailedAlert = "Your browser does not support the enhanced functionality of this website, and therefore you will have an experience that differs from the intended one.\n";

    this.requestFile = file;

    this.method = "POST";

    this.URLString = "";

    this.encodeURIString = true;

    this.execute = false;

    this.onLoading = function () {};

    this.onLoaded = function () {};

    this.onInteractive = function () {};

    this.onCompletion = function () {};

    this.createAJAX = function () {

        try {

            this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");

        } catch(e) {

            try {

                this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

            } catch(err) {

                this.xmlhttp = null;

            }

        }

        if (!this.xmlhttp && typeof XMLHttpRequest != "undefined") this.xmlhttp = new XMLHttpRequest();

        if (!this.xmlhttp) {

            this.failed = true;

        }

    };

    this.setVar = function (name, value) {

        if (this.URLString.length < 3) {

            this.URLString = name + "=" + value;

        } else {

            this.URLString += "&" + name + "=" + value;

        }

    };

    this.encVar = function (name, value) {

        var varString = encodeURIComponent(name) + "=" + encodeURIComponent(value);

        return varString;

    };

    this.encodeURLString = function (string) {

        varArray = string.split('&');

        for (i = 0; i < varArray.length; i++) {

            urlVars = varArray[i].split('=');

            if (urlVars[0].indexOf('amp;') != -1) {

                urlVars[0] = urlVars[0].substring(4);

            }

            varArray[i] = this.encVar(urlVars[0], urlVars[1]);

        }

        return varArray.join('&');

    };

    this.runResponse = function () {

        eval(this.response);

    };

    this.runAJAX = function (urlstring) {

        this.responseStatus = new Array(2);

        if (this.failed && this.AjaxFailedAlert) {

            alert(this.AjaxFailedAlert);

        } else {

            if (urlstring) {

                if (this.URLString.length) {

                    this.URLString = this.URLString + "&" + urlstring;

                } else {

                    this.URLString = urlstring;

                }

            }

            if (this.encodeURIString) {

                var timeval = new Date().getTime();

                this.URLString = this.encodeURLString(this.URLString);

                this.setVar("rndval", timeval);

            }

            if (this.element) {

                this.elementObj = document.getElementById(this.element);

            }

            if (this.xmlhttp) {

                var self = this;

                if (this.method == "GET") {

                    var totalurlstring = this.requestFile + "?" + this.URLString;

                    this.xmlhttp.open(this.method, totalurlstring, true);

                } else {

                    this.xmlhttp.open(this.method, this.requestFile, true);

                }

                if (this.method == "POST") {

                    try {

                        this.xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

                    } catch(e) {}

                }

                this.xmlhttp.send(this.URLString);

                this.xmlhttp.onreadystatechange = function () {

                    switch (self.xmlhttp.readyState) {

                    case 1:

                        self.onLoading();

                        break;

                    case 2:

                        self.onLoaded();

                        break;

                    case 3:

                        self.onInteractive();

                        break;

                    case 4:

                        self.response = self.xmlhttp.responseText;

                        self.responseXML = self.xmlhttp.responseXML;

                        self.responseStatus[0] = self.xmlhttp.status;

                        self.responseStatus[1] = self.xmlhttp.statusText;

                        self.onCompletion();

                        if (self.execute) {

                            self.runResponse();

                        }

                        if (self.elementObj) {

                            var elemNodeName = self.elementObj.nodeName;

                            elemNodeName.toLowerCase();

                            if (elemNodeName == "input" || elemNodeName == "select" || elemNodeName == "option" || elemNodeName == "textarea") {

                                self.elementObj.value = self.response;

                            } else {

                                self.elementObj.innerHTML = self.response;

                            }

                        }

                        self.URLString = "";

                        break;

                    }

                };

            }

        }

    };

    this.createAJAX();

}