/*##############################################################################
 
  This is a modified SACK 1.6 Library available from Twilight Universe  
  http://twilightuniverse.com/resources/code/sack/ 
  
  Modifications: Hugo Weijes 28 DEC 2006 added vars2 + getVar(), added 'return' 
  and 'var' statements to remove javascript warnings in FireFox
  
##############################################################################*/
/* 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.vars2 = new Array();
  	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.vars2[name] = value;
  };
      
  this.getVar = function(name) {
    if(this.vars2[name]==undefined) return ""; else return this.vars2[name];
  };
 
  this.encVar = function(name, value, returnvars) {
  	if (true == returnvars) {
  		return Array(encodeURIComponent(name), encodeURIComponent(value));
  	} else {
  		this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
      return false;
  	}
  }
 
  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());
 
  	var urlstringtemp = new Array();
  	for (key in this.vars) {
  		if (false == this.vars[key][1] && true == this.encodeURIString) {
  			var 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();
}