/* 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();
}

function createRequest()
{
	var aXmlHttp = null;

	if(window.XMLHttpRequest) //Mozilla, Safari,...
	{
		aXmlHttp = new XMLHttpRequest();

		if(aXmlHttp.overrideMimeType)
			aXmlHttp.overrideMimeType('text/xml'); //https://bugzilla.mozilla.org/show_bug.cgi?id=311724
	}
	else if(window.ActiveXObject) //IE
	{
		var aXmlObjects = null;
		aXmlObjects = new Array();

		aXmlObjects[0] = "Msxml2.XMLHTTP";
		aXmlObjects[1] = "Microsoft.XMLHTTP";

		var i = null;

		for(i = 0; i < aXmlObjects.length; i++)
		{
			try
			{
				aXmlHttp = new ActiveXObject(aXmlObjects[i]);
				break;
			}
			catch(e)
			{
			}
		}
	}

	if(!aXmlHttp)
	{
		throw "This navigator does not support asynchronous calls"; 
	}
	else
	{
		return aXmlHttp;
	}
}

function sendRequest(aXmlHttp, sURL, aHandler, bNoCached, bSynchronous)
{
	if(!aXmlHttp)
		return;

	if(!(aXmlHttp.readyState === 4 || aXmlHttp.readyState === 0))
		aXmlHttp.abort();

	if(bNoCached == null)
		bNoCached = false;

	if(bSynchronous == null)
		bSynchronous = false;

	if(bNoCached)
		sURL = getNoCachedURL(sURL);

	aXmlHttp.open('GET', sURL, !bSynchronous);

	if(aHandler)
		aXmlHttp.onreadystatechange = function() { aHandler(aXmlHttp); };
	aXmlHttp.send(null);
}

function makeRequest(sURL, aHandler, bNoCached, bSynchronous)
{
	sendRequest(createRequest(), sURL, aHandler, bNoCached, bSynchronous);
}

function getNoCachedURL(sURL)
{
	return sURL + (sURL.indexOf("?") != -1 ? "&" : "?") + "__=" + encodeURIComponent(getUniqueValue());
}

function getUniqueValue()
{
	return new Date().getTime() + parseInt(Math.random() * 100);
}

function isCompleted(aXmlHttp)
{
	return aXmlHttp.readyState == 4 || aXmlHttp.readyState == "complete";
}

function getResponse(aXmlHttp)
{
	if(aXmlHttp.status == 200)
		return unescape(aXmlHttp.responseText);
	else
		return '';
}