/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* ©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.xmlhttp = null;

 this.resetData = function() {
  this.method = "POST";
    this.queryStringSeparator = "?";
  this.argumentSeparator = "&";
  this.URLString = "";
  this.encodeURIString = true;
    this.execute = false;
    this.element = null;
  this.elementObj = null;
  this.requestFile = file;
  this.vars = new Object();
  this.responseStatus = new Array(2);
   };

 this.resetFunctions = function() {
    this.onLoading = function() { };
    this.onLoaded = function() { };
    this.onInteractive = function() { };
    this.onCompletion = function() { };
    this.onError = function() { };
  this.onFail = function() { };
 };

 this.reset = function() {
  this.resetFunctions();
  this.resetData();
 };

 this.createAJAX = function() {
  try {
   this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e1) {
   try {
    this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
   } catch (e2) {
    this.xmlhttp = null;
   }
  }

  if (! this.xmlhttp) {
   if (typeof XMLHttpRequest != "undefined") {
    this.xmlhttp = new XMLHttpRequest();
   } else {
    this.failed = true;
   }
  }
 };

 this.setVar = function(name, value){
  this.vars[name] = Array(value, false);
 };

 this.encVar = function(name, value, returnvars) {
  if (true == returnvars) {
   return Array(encodeURIComponent(name), encodeURIComponent(value));
  } else {
   this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
  }
 }

 this.processURLString = function(string, encode) {
  encoded = encodeURIComponent(this.argumentSeparator);
  regexp = new RegExp(this.argumentSeparator + "|" + encoded);
  varArray = string.split(regexp);
  for (i = 0; i < varArray.length; i++){
   urlVars = varArray[i].split("=");
   if (true == encode){
    this.encVar(urlVars[0], urlVars[1]);
   } else {
    this.setVar(urlVars[0], urlVars[1]);
   }
  }
 }

 this.createURLString = function(urlstring) {
  if (this.encodeURIString && this.URLString.length) {
   this.processURLString(this.URLString, true);
  }

  if (urlstring) {
   if (this.URLString.length) {
    this.URLString += this.argumentSeparator + urlstring;
   } else {
    this.URLString = urlstring;
   }
  }

  // prevents caching of URLString
  this.setVar("rndval", new Date().getTime());

  urlstringtemp = new Array();
  for (key in this.vars) {
   if (false == this.vars[key][1] && true == this.encodeURIString) {
    encoded = this.encVar(key, this.vars[key][0], true);
    delete this.vars[key];
    this.vars[encoded[0]] = Array(encoded[1], true);
    key = encoded[0];
   }

   urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
  }
  if (urlstring){
   this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
  } else {
   this.URLString += urlstringtemp.join(this.argumentSeparator);
  }
 }

 this.runResponse = function() {
  eval(this.response);
 }

 this.runAJAX = function(urlstring) {
  if (this.failed) {
   this.onFail();
  } else {
   this.createURLString(urlstring);
   if (this.element) {
    this.elementObj = document.getElementById(this.element);
   }
   if (this.xmlhttp) {
    var self = this;
    if (this.method == "GET") {
     totalurlstring = this.requestFile + this.queryStringSeparator + this.URLString;
     this.xmlhttp.open(this.method, totalurlstring, true);
    } else {
     this.xmlhttp.open(this.method, this.requestFile, true);
     try {
      this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
     } catch (e) { }
    }

    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;

       if (self.execute) {
        self.runResponse();
       }

       if (self.elementObj) {
        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;
        }
       }
       if (self.responseStatus[0] == "200") {
        self.onCompletion();
       } else {
        self.onError();
       }

       self.URLString = "";
       break;
     }
    };

    this.xmlhttp.send(this.URLString);
   }
  }
 };

 this.reset();
 this.createAJAX();
}