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();
}