scheduler._loaded={};
scheduler._load=function(url,from){
	url=url||this._load_url;
	url+=(url.indexOf("?")==-1?"?":"&")+"timeshift="+(new Date()).getTimezoneOffset();
	if (this.config.prevent_cache)	url+="&uid="+this.uid();
	var to;
	from=from||this._date;
	
	if (this._load_mode){
		var lf = this.templates.load_format;
		
		from = this.date[this._load_mode+"_start"](new Date(from.valueOf()));
		while (from>this._min_date) from=this.date.add(from,-1,this._load_mode);
		to = from;
		
		var cache_line = true;
		while (to<this._max_date){
			to=this.date.add(to,1,this._load_mode);	
			if (this._loaded[lf(from)] && cache_line) 
				from=this.date.add(from,1,this._load_mode);	
			else cache_line = false;
		}
		
		var temp_to=to;
		do {
			to = temp_to;
			temp_to=this.date.add(to,-1,this._load_mode);
		} while (temp_to>from && this._loaded[lf(temp_to)]);
			
		if (to<=from) 
			return false; //already loaded
		dhtmlxAjax.get(url+"&from="+lf(from)+"&to="+lf(to),function(l){scheduler.on_load(l);});
		while(from<to){
			this._loaded[lf(from)]=true;
			from=this.date.add(from,1,this._load_mode);	
		}
	} else
		dhtmlxAjax.get(url,function(l){scheduler.on_load(l);});
	this.callEvent("onXLS",[]);
	return true;
}
scheduler.on_load=function(loader){
	this._loading=true;
	if (this._process)
		var evs=this[this._process].parse(loader.xmlDoc.responseText);
	else
		var evs=this._magic_parser(loader);
	
	this._not_render=true;
	for (var i=0; i<evs.length; i++){
		if (!this.callEvent("onEventLoading",[evs[i]])) continue;
		this.addEvent(evs[i]);
	}
	this._not_render=false;
	if (this._render_wait) this.render_view_data();
	
	if (this._after_call) this._after_call();
	this._after_call=null;
	this._loading=false;
	this.callEvent("onXLE",[]);
}
scheduler.json={};
scheduler.json.parse = function(data){
	if (typeof data == "string"){
		eval("scheduler._temp = "+data+";");
		data = scheduler._temp;
	}
	var evs = [];
	for (var i=0; i < data.length; i++){
		data[i].start_date = scheduler.templates.xml_date(data[i].start_date);
		data[i].end_date = scheduler.templates.xml_date(data[i].end_date);
		evs.push(data[i]);
	}
	return evs;
}
scheduler.parse=function(data,type){
	this._process=type;
	this.on_load({xmlDoc:{responseText:data}});
}
scheduler.load=function(url,call){
	if (typeof call == "string"){
		this._process=call;
		call = arguments[2];
	}
	
	this._load_url=url;
	this._after_call=call;
	this._load(url,this._date);
};
//possible values - day,week,month,year,all
scheduler.setLoadMode=function(mode){
	if (mode=="all") mode="";
	this._load_mode=mode;
};

//current view by default, or all data if "true" as parameter provided
scheduler.refresh=function(refresh_all){
	alert("not implemented");
	/*
	this._loaded={};
	this._load();
	*/
}
scheduler.serverList=function(name){
	return this.serverList[name] = (this.serverList[name]||[]);
}

scheduler._userdata={};
scheduler._magic_parser=function(loader){
	if (!loader.getXMLTopNode){ //from a string
		var xml_string = loader.xmlDoc.responseText;
		loader = new dtmlXMLLoaderObject(function(){});
		loader.loadXMLString(xml_string);
	}
	
	var xml=loader.getXMLTopNode("data");
	if (xml.tagName!="data") return [];//not an xml
	
	var opts = loader.doXPath("//coll_options");
	for (var i=0; i < opts.length; i++) {
		var bind = opts[i].getAttribute("for");
		var arr = this.serverList[bind];
		if (!arr) continue;
		arr.splice(0,arr.length);	//clear old options
		var itms = loader.doXPath(".//item",opts[i]);
		for (var j=0; j < itms.length; j++)
			arr.push({ key:itms[j].getAttribute("value"), label:itms[j].getAttribute("label")});
	}
	if (opts.length)
		scheduler.callEvent("onOptionsLoad",[]);
	
	var ud=loader.doXPath("//userdata");	
	for (var i=0; i < ud.length; i++) {
		var udx = this.xmlNodeToJSON(ud[i]);
		this._userdata[udx.name]=udx.text;
	};
	
	var evs=[];
	var xml=loader.doXPath("//event");
	
	
	for (var i=0; i < xml.length; i++) {
		evs[i]=this.xmlNodeToJSON(xml[i])
		
		evs[i].text=evs[i].text||evs[i]._tagvalue;
		evs[i].start_date=this.templates.xml_date(evs[i].start_date);
		evs[i].end_date=this.templates.xml_date(evs[i].end_date);
	}
	return evs;
}
scheduler.xmlNodeToJSON = function(node){
        var t={};
        for (var i=0; i<node.attributes.length; i++)
            t[node.attributes[i].name]=node.attributes[i].value;
        
        for (var i=0; i<node.childNodes.length; i++){
        	var child=node.childNodes[i];
            if (child.nodeType==1)
                t[child.tagName]=child.firstChild?child.firstChild.nodeValue:"";
        }
                 
        if (!t.text) t.text=node.firstChild?node.firstChild.nodeValue:"";
        
        return t;
}

scheduler.attachEvent("onXLS",function(){
	if (this.config.show_loading===true){
		var t;
		t=this.config.show_loading=document.createElement("DIV");
		t.className='dhx_loading';
		t.style.left = Math.round((this._x-128)/2)+"px";
		t.style.top = Math.round((this._y-15)/2)+"px";
		this._obj.appendChild(t);
	}
});
scheduler.attachEvent("onXLE",function(){
	var t;
	if (t=this.config.show_loading)
		if (typeof t == "object"){
		this._obj.removeChild(t);
		this.config.show_loading=true;
	}
});