var arrCnt = 0;
var eDealXmlhttpArr = new Array();
var eDealXmlCallbackArr = new Array();
var pageLoaded = false;
var pileIndex = new Array();
var pileParam = new Array();

// Delay doAjax calls after the page has fully loaded
// JQuery has to be loaded before, so we test if this is the case
if (typeof $ == 'function') {
	$(document).ready(function () {
		var index = null ;
		while((index = pileIndex.shift())!=null){
			eDealXmlhttpArr[index].send(pileParam.shift());
		}
		pageLoaded = true;
	});
}

function eDealAjaxCallBack(arrIndex) {
	if (eDealXmlhttpArr[arrIndex].readyState == 4) {
		hideWaiting();
		eval(eDealXmlhttpArr[arrIndex].responseText);
	}
}

function getNewAjaxObject(){
	var ajaxObject = null;
	
	try {
		ajaxObject = new ActiveXObject("Msxml2.XMLHTTP");
	} catch(e) {
		try {
			ajaxObject = new ActiveXObject("Microsoft.XMLHTTP");
		} catch(oc) {
			ajaxObject = null;
		}
	}
	
	if (!ajaxObject && typeof XMLHttpRequest != "undefined") {
		ajaxObject = new XMLHttpRequest();
	}
	
	return ajaxObject;
}

/*
 * Allowing to perform a synchronous Ajax calling to URL
 * in order to wait the result.
 */ 
function doSynchronAjax(url) { 
	return $.ajax({url: url, async: false}).responseText;
} 

function doAjax(url, callback, type, parameters) {
	if (callback == null) {
		callback = eDealAjaxCallBack;
	}
	
	eDealXmlCallbackArr[arrCnt] = callback;
	eDealXmlhttpArr[arrCnt] = getNewAjaxObject();
	
	var ajaxCallback;
	eval('ajaxCallback = function(){ var fPtr = eDealXmlCallbackArr[' + arrCnt + ']; fPtr(' + arrCnt + '); }');
	eDealXmlhttpArr[arrCnt].onreadystatechange = ajaxCallback;
	
	var callType;
	if (type != null) {
		callType = type;
	} else {
		callType = "GET";
	}
	
	if(callType=="GET" && parameters!=null && parameters!=""){
		if(url.indexOf("?")==-1){
			url+="?"+parameters;
		}else{
			url+="&"+parameters;
		}
		parameters=null;
	}
	eDealXmlhttpArr[arrCnt].open(callType, url, true);
	if (callType=="POST" && parameters!=null) {
		eDealXmlhttpArr[arrCnt].setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	}
	
	if(!pageLoaded){
		pileIndex.push(arrCnt);
		pileParam.push(parameters);
	}else{
		showWaiting();
		eDealXmlhttpArr[arrCnt].send(parameters);
	}
	
	arrCnt = arrCnt + 1;
	
	return url;
}

function showWaiting() {
	var node = document.getElementById("waiting");
	if (node != null) {
		node.style.display = "block";
		node.style.bottom = "0px";
		node.style.right = "0px";
		node.style.zIndex = "20000";
	}
}

function hideWaiting() {
	var node = document.getElementById("waiting");
	if (node != null) {
		node.style.display = "none";
	}
}


function doBackgroundAjax(url,displayFunction,htmlElementIDForResponse) {
	showWaiting();
	if (displayFunction==null) {
		displayFunction=globalBackgoundStatusDisplayFunction;
	}
	doAjax(url,function(arrIndex) {
			if (eDealXmlhttpArr[arrIndex].readyState == 4) {
				hideWaiting();
				var jsonRespTxt = eDealXmlhttpArr[arrIndex].responseText;
				var jsonResponse=JSON.parse(jsonRespTxt);
				displayFunction(jsonResponse,htmlElementIDForResponse);
			}
		},"GET",null); 
}