function ajax_debug(text){

	if (AJAX_DEBUG_MODE){alert("RSD: " + text);}

}

function ajax_init_object(){

	ajax_debug("ajax_init_object() called..");

	var A;

	var msxmlhttp = new Array('Msxml2.XMLHTTP.5.0','Msxml2.XMLHTTP.4.0','Msxml2.XMLHTTP.3.0','Msxml2.XMLHTTP','Microsoft.XMLHTTP');

	for(var i = 0; i < msxmlhttp.length; i++)

	{

		try{A = new ActiveXObject(msxmlhttp[i]);}catch (e){A = null;}

	}                                                      		

	if(!A && typeof XMLHttpRequest != "undefined"){A = new XMLHttpRequest();}

	if(!A){ajax_debug("Could not create connection object.");}

	return A;

}

var ajax_requests = new Array();

function ajax_cancel() {

	for(var i = 0; i < ajax_requests.length; i++){ajax_requests[i].abort();}

}

function ajax_do_call(func_name, args)

{

	var i, x, n;

	var uri;

	var post_data;

	var target_id;	

	ajax_debug("in ajax_do_call().." + AJAX_REQUEST_TYPE + "/" + AJAX_TARGET_ID);

	target_id = AJAX_TARGET_ID;	

	if(typeof(AJAX_REQUEST_TYPE) == "undefined" || AJAX_REQUEST_TYPE == ""){AJAX_REQUEST_TYPE = "GET";}

	uri = AJAX_REMOTE_URI;

    if(AJAX_REQUEST_TYPE == "GET"){

		if(uri.indexOf("?") == -1){uri += "?rs=" + escape(func_name);}

		else{uri += "&rs=" + escape(func_name);}

		uri += "&rst=" + escape(AJAX_TARGET_ID);

		uri += "&rsrnd=" + new Date().getTime();		

		for(i = 0; i < args.length-1; i++){

			uri += "&rsargs[]=" + encodeURI(args[i]); //encodeURIComponent(args[i]); //escape(args[i]);

		}

		post_data = null;

	} else if(AJAX_REQUEST_TYPE == "POST") {

		post_data = "rs=" + escape(func_name);

		post_data += "&rst=" + escape(AJAX_TARGET_ID);

		post_data += "&rsrnd=" + new Date().getTime();		

		for (i = 0; i < args.length-1; i++){

			post_data = post_data + "&rsargs[]=" + escape(args[i]);

		}

	}else{

		alert("Lenh yeu cau khong hop le: " + AJAX_REQUEST_TYPE);

	}    	

	x = ajax_init_object();	

	if(x == null){

		if (AJAX_FAILURE_REDIRECT != ""){location.href = AJAX_FAILURE_REDIRECT;return false;}

		else{ajax_debug("Trinh duyet khong ho tro javascript:\n" + navigator.userAgent);return false;}

	}else{

		x.open(AJAX_REQUEST_TYPE, uri, true);	

		ajax_requests[ajax_requests.length] = x;		

		if (AJAX_REQUEST_TYPE == "POST"){

			x.setRequestHeader("Method", "POST " + uri + " HTTP/1.1");

			x.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

		}                               	

		ajaxLoadingBox = fetch_object("loadingbox");

		ajaxLoadingBox.style.display = 'block';

		ajaxLoadingBox.style.top = document.body.scrollTop;

		x.onreadystatechange = function(){						

			if(x.readyState != 4){ 

				if(target_id != ""){document.getElementById(target_id).innerHTML='	<div id="loadingbox">Loading...</div>';}

				return;

			}

			ajaxLoadingBox.style.display = '';

			ajax_debug("Du lieu tra ve " + x.responseText);		

			var status;

			var data;

			var txt = x.responseText.replace(/^\s*|\s*$/g,"");

			status = txt.charAt(0);

			data = txt.substring(2);

			if (status == ""){	}

			else if (status == "-"){alert("Error: " + data);}

			else{

				if (target_id != ""){document.getElementById(target_id).innerHTML = data;}

				else{

					try{

						var callback;

						var extra_data = false;

						if (typeof args[args.length-1] == "object"){

							callback = args[args.length-1].callback;

							extra_data = args[args.length-1].extra_data;

						}else{

							callback = args[args.length-1];

						}

						callback(data, extra_data);

					}catch (e){

						ajax_debug("Loi duoc tim thay " + e + ": Khong the thuc thi code " + data );

					}

				}

			}

		}

	} 	

	ajax_debug(func_name + " uri = " + uri + "/post = " + post_data);

	x.send(post_data);

	ajax_debug(func_name + " loading...");

	delete x;

	return true;

}