// JavaScript Document
function loadXMLString(txt) 
{
	try //Internet Explorer
	{
		xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
		xmlDoc.async = "false";
		xmlDoc.loadXML(txt);
		return xmlDoc; 
	}
	catch(e)
	{
		try //Firefox, Mozilla, Opera, etc.
		{
			var parser = new DOMParser();
			xmlDoc = parser.parseFromString(txt, "text/xml");
			return xmlDoc;
		}
		catch(e) {alert(e.message)}
	}
	return null;
}
function getXmlValue(xmlDoc, tagName, defaultVal)
{
	var node = xmlDoc.getElementsByTagName(tagName)[0];
	
	if (defaultVal == undefined)
		defaultVal = "";
	
	if (node == null)
		return defaultVal;
	
	if (node.childNodes.length > 0)
		return node.childNodes[0].nodeValue;
	else
		return defaultVal;
}
function loadXMLDoc(docurl, callback, async)
{
	if (async)
		return loadXMLDocAsync(docurl, callback);
	else
		return loadXMLDocSync(docurl);
}

function loadXMLDocAsync(docurl, callback)
{
	var xmlhttp = null;
	var xmlDoc = null;
	
	if (window.XMLHttpRequest)
	{
		// code for all new browsers
		xmlhttp = new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		// code for IE5 and IE6
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	if (xmlhttp != null)
	{
		xmlhttp.onreadystatechange = function()
			{
				var error = false;
				
				if (xmlhttp.readyState == 4)
				{
					// 4 = "loaded"
					if (xmlhttp.status == 200)
					{
						// 200 = OK
						xmlDoc = loadXMLString(xmlhttp.responseText);
						
						if (xmlDoc == null)
						{
							alert("Problem parsing XML string");
						}
						else if (validateAjaxResponse(xmlDoc))
						{
							if (typeof callback == 'function')
							{
								callback(xmlDoc);
							}
							else
							{
								alert("Callback function '" + callback + "' could not be found.");
							}
						}
					}
					else
					{
						alert("Problem retrieving XML data");
					}
				}
			};
		xmlhttp.open("GET", docurl, true);
		xmlhttp.send(null);
	}
	else
	{
		alert("Your browser does not support XMLHTTP.");
	}
}

function loadXMLDocSync(docurl)
{
	try // Internet Explorer
	{
		xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
	}
	catch(e)
	{
		try // Firefox, Mozilla, Opera, etc.
		{
			xmlDoc = document.implementation.createDocument("", "", null);
		}
		catch(e)
		{
			alert(e.message)
		}
	}
	
	try 
	{
		xmlDoc.async = false;
		xmlDoc.load(docurl);
		
		if (validateAjaxResponse(xmlDoc))
			return xmlDoc;
	}
	catch(e)
	{
		alert(e.message)
	}
	return null;
}

function validateAjaxResponse(xmlDoc)
{
	var nodes = xmlDoc.getElementsByTagName("error");
	
	if (nodes.length > 0)
	{
		switch (nodes[0].firstChild.nodeValue)
		{
			case "Not logged in":
				document.location.href = "/login";
				break;
			default:
				return true;
		}
		
		return false;
	}
	
	return true;
}


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();
}