/* Simple AJAX Code-Kit (SACK) */
/* В©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();
}