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");
		}
		x.onreadystatechange = function(){
			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;
}