/* Simple AJAX Code-Kit (SACK) ©2005 Gregory Wild-Smith www.twilightuniverse.com Software licenced under a modified X11 licence, see documentation or authors website for more details */
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();
}