JHRController = function(){
	var _t = this;
	_t.loadings_counter = 0;
	_t.loadings = {};
	_t.time_quant = 2000;
	_t.default_timeout = 30000;
	_t.created = false;
	_t.content = '<span style="background-color:rgb(205,68,65); color:white">Загрузка...</span>';
	_t.parent_domid = null;
	
	_t.DebugMessenger = function(text){
		alert(text);
	}
	
	_t.SysMessenger = function(text){
		alert(text);
	}
	
	_t.UserMessenger = function(text){
		alert(text);
	}
	
	function _setAttribute(obj,attr,value){
		if (obj.setAttribute && (attr!='innerHTML')) obj.setAttribute(attr, value)
			else obj[attr] = value;
	}
	
	_t.create = function(){
		if (!_t.parent_domid){
			_t.parent_domid = 'JHRControllerLoaderBox';
			if (!document.getElementById(_t.parent_domid)){
				var loaderbox = document.createElement('DIV');
				_setAttribute(loaderbox,'innerHTML',_t.content);
				cssStyles= 'position:absolute; z-index:999; top:0px; left:0px; display:none;';
				if (loaderbox.style) loaderbox.style.cssText = cssStyles;
					else  _setAttribute(loaderbox,'style',cssStyles);
				_setAttribute(loaderbox,'id',_t.parent_domid);
				if (document.getElementsByTagName("body").length){
					body = document.getElementsByTagName("body")[0]
					body.appendChild(loaderbox);
				}
			}
		} else {
			document.getElementById(_t.parent_domid).innerHTML = _t.content;
		}
		_t.created = true;
	}
	
	_t.refresh = function(){
		if (!_t.created) _t.create();
		el = document.getElementById(_t.parent_domid)
		if (el){
			if (_t.loadings_counter>0) {
				el.style.display = "block";
				//if klayers loaded
				if (typeof(getScrollY)=='function'){
					el.style.top = getScrollY()+"px";
				}
			}
			else{
				el.style.display = "none";
			}
		}
	}
		
	_t.beginLoad = function(counter, timeout){
		_t.loadings_counter++;
		var date = new Date()
		_t.loadings[counter] = new Date().getTime() + timeout;
		_t.refresh();
	}
		
	_t.endLoad = function(counter){
		if (_t.loadings[counter]){
			_t.loadings_counter--;
			delete _t.loadings[counter];
		}
		_t.refresh();
	}
	
	_t.timer = function(){
		//
		if (_t.created){
			var cur_time = new Date().getTime();
			for (var i in _t.loadings){
				if (cur_time > _t.loadings[i]){
					delete _t.loadings[i];
					_t.SysMessenger('Превышен таймаут ожидания ответа сервера. Возможно один из последних запросов не был выполнен.');
					_t.loadings_counter--;
					_t.refresh();
				}
			}
			
		}
		setTimeout(_t.timer,_t.time_quant);
	}
	_t.timer();
		
}

JsHttpRequest.JHRController = new JHRController();

JsHttpRequest.query = function(url, content, onready, nocache, timeout) {
	var gr = this;
	if (!timeout) timeout = gr.JHRController.default_timeout;
	var query_id = JsHttpRequest.COUNT;
	gr.JHRController.beginLoad(query_id, timeout);
	var req = new this();
	req.caching = !nocache;
	req.onreadystatechange = function() {
		if (req.readyState == 4) {
			gr.JHRController.endLoad(query_id);
			onready(req.responseJS, req.responseText);
		}
	}
	var method = null;
	if (url.match(/^((\w+)\.)?(GET|POST)\s+(.*)/i)) {
		req.loader = RegExp.$2? RegExp.$2 : null;
		method = RegExp.$3;
		url = RegExp.$4;
	}
	req.open(method, url, true);
	req.send(content);
}