//Basic Ajax Routine- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated: Jan 15th, 06'

function createAjaxObj() {
	var httprequest=false
	if (window.XMLHttpRequest) { // if Mozilla, Safari etc
		httprequest=new XMLHttpRequest()
		if (httprequest.overrideMimeType)
			httprequest.overrideMimeType('text/xml')
	} else if (window.ActiveXObject) { // if IE
		try {
			httprequest=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				httprequest=new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
			}
		}
	}
	return httprequest
}

var ajaxpack=new Object()
ajaxpack.basedomain="http://"+window.location.hostname
ajaxpack.ajaxobj=createAjaxObj()
ajaxpack.filetype="txt"
ajaxpack.addrandomnumber=0 //Set to 1 or 0. See documentation.


ajaxpack.getAjaxRequest = function(url, parameters, callbackfunc, filetype) {
	ajaxpack.ajaxobj=createAjaxObj() //recreate ajax object to defeat cache problem in IE
	if (ajaxpack.addrandomnumber==1) //Further defeat caching problem in IE?
		var parameters=parameters+"&ajaxcachebust="+new Date().getTime()
	if (this.ajaxobj) {
		this.filetype=filetype
		this.ajaxobj.onreadystatechange=callbackfunc
		this.ajaxobj.open('GET', url+"?"+parameters, true)
		this.ajaxobj.send(null)
	}
}

ajaxpack.postAjaxRequest = function(url, parameters, callbackfunc, filetype) {
	ajaxpack.ajaxobj=createAjaxObj() //recreate ajax object to defeat cache problem in IE
	if (this.ajaxobj) {
		this.filetype=filetype
		this.ajaxobj.onreadystatechange = callbackfunc;
		this.ajaxobj.open('POST', url, true);
		this.ajaxobj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		this.ajaxobj.setRequestHeader("Content-length", parameters.length);
		this.ajaxobj.setRequestHeader("Connection", "close");
		this.ajaxobj.send(parameters);
	}
}


// ================= Emil code =================================
function ajaxCallback() {
	var myajax=ajaxpack.ajaxobj;
	var myfiletype=ajaxpack.filetype;
	if (myajax.readyState == 4) { //if request of file completed
		if (myajax.status==200 || window.location.href.indexOf("http")==-1) { 
			if (myajax.responseText=="") {
				
			} else {
				var ind = myajax.responseText.indexOf( "+@+" );
				if (ind >= 0) {
					var jscode = myajax.responseText.substr(0, ind); 
					var jsrest = myajax.responseText.substring(ind+3, myajax.responseText.length); 
					document.getElementById(__divContent).innerHTML = jsrest;
					eval(jscode);
				} else {
					// no javascript included in response
					document.getElementById(__divContent).innerHTML = myajax.responseText;
				}
			}
		} else {
			document.getElementById(__divContent).innerHTML = "There was a problem retrieving data:<br>"+ myajax.responseText;
			alert("There was a problem with the AJAX call...");
		}
		ajaxrunning = false;
		runNextFromQueue();
	}
}

ajaxpack.targetQueue = new Array();
ajaxpack.urlQueue = new Array();
ajaxpack.paramQueue = new Array();
ajaxpack.filetypeQueue = new Array();
var ajaxrunning = false;
var __divContent="";

ajaxpack.queuePostAjaxRequest = function(url, parameters, filetype, targetDiv) {
	ajaxpack.targetQueue.push(targetDiv);
	ajaxpack.urlQueue.push(url);
	ajaxpack.paramQueue.push(parameters);
	ajaxpack.filetypeQueue.push(filetype);
	if (!ajaxrunning)
		runNextFromQueue();
}
function runNextFromQueue() {
	if (ajaxrunning)
		return;
	if (ajaxpack.urlQueue.length <= 0)
		return;
	var thisTarget = ajaxpack.targetQueue.shift();
	var thisUrl = ajaxpack.urlQueue.shift();
	var thisParams = ajaxpack.paramQueue.shift();
	var thisFiletype = ajaxpack.filetypeQueue.shift();
	__divContent = thisTarget;
	ajaxpack.addrandomnumber=1;
	document.getElementById(__divContent).innerHTML = "<img src='./images/indicator.gif'>";
	ajaxrunning = true;
	ajaxpack.postAjaxRequest(thisUrl, thisParams, ajaxCallback, thisFiletype);
}
// ================= Emil code =================================

//ACCESSIBLE VARIABLES (for use within your callback functions):
//1) ajaxpack.ajaxobj //points to the current ajax object
//2) ajaxpack.filetype //The expected file type of the external file ("txt" or "xml")
//3) ajaxpack.basedomain //The root domain executing this ajax script, taking into account the possible "www" prefix.
//4) ajaxpack.addrandomnumber //Set to 0 or 1. When set to 1, a random number will be added to the end of the query string of GET requests to bust file caching of the external file in IE. See docs for more info.

//ACCESSIBLE FUNCTIONS:
//1) ajaxpack.getAjaxRequest(url, parameters, callbackfunc, filetype)
//2) ajaxpack.postAjaxRequest(url, parameters, callbackfunc, filetype)

///////////END OF ROUTINE HERE////////////////////////


//////EXAMPLE USAGE ////////////////////////////////////////////
/* Comment begins here

//Define call back function to process returned data
function processGetPost(){
var myajax=ajaxpack.ajaxobj
var myfiletype=ajaxpack.filetype
if (myajax.readyState == 4){ //if request of file completed
if (myajax.status==200 || window.location.href.indexOf("http")==-1){ if request was successful or running script locally
if (myfiletype=="txt")
alert(myajax.responseText)
else
alert(myajax.responseXML)
}
}
}

/////1) GET Example- alert contents of any file (regular text or xml file):

ajaxpack.getAjaxRequest("example.php", "", processGetPost, "txt")
ajaxpack.getAjaxRequest("example.php", "name=George&age=27", processGetPost, "txt")
ajaxpack.getAjaxRequest("examplexml.php", "name=George&age=27", processGetPost, "xml")
ajaxpack.getAjaxRequest(ajaxpack.basedomain+"/mydir/mylist.txt", "", processGetPost, "txt")

/////2) Post Example- Post some data to a PHP script for processing, then alert posted data:

//Define function to construct the desired parameters and their values to post via Ajax
function getPostParameters(){
var namevalue=document.getElementById("namediv").innerHTML //get name value from a DIV
var agevalue=document.getElementById("myform").agefield.value //get age value from a form field
var poststr = "name=" + encodeURI(namevalue) + "&age=" + encodeURI(agevalue)
return poststr
}

var poststr=getPostParameters()

ajaxpack.postAjaxRequest("example.php", poststr, processGetPost, "txt")
ajaxpack.postAjaxRequest("examplexml.php", poststr, processGetPost, "xml")

Comment Ends here */