function xhr(przycisk){
var rquest;
var Ling;
var Menu;

if(przycisk == "start"){
	Ling = document.getElementById('lung').innerHTML;
	makeRequest('wklad.php', 'a=start&b='+Ling);
	}
if(przycisk =="oferta"){
	Ling = document.getElementById('lung').innerHTML;
	makeRequest('wklad.php', 'a=oferta&b='+Ling);
	}
if(przycisk =="portfolio"){
	Ling = document.getElementById('lung').innerHTML;
	makeRequest('wklad.php', 'a=portfolio&b='+Ling);
	}
if(przycisk =="kontakt"){
	Ling = document.getElementById('lung').innerHTML;
	makeRequest('wklad.php', 'a=kontakt&b='+Ling);
	}
if(przycisk =="lng"){
	Ling = document.getElementById('lung').innerHTML;
	Menu = document.getElementById('msel').innerHTML;	
	if(Ling=='pl')
		makeRequest('wklad.php', 'a='+Menu+'&b=eng');
	else
		makeRequest('wklad.php', 'a='+Menu+'&b=pl');
	}
if(przycisk=='portfolioPrzycisk'){
	Ling = document.getElementById("lung").innerHTML;
	Menu = document.getElementById("msel").innerHTML;
	if(Menu == "portfolio")
		makeRequest("wklad.php", "a=portfolio2&b="+Ling);
	else
		makeRequest("wklad.php", "a=portfolio&b="+Ling);
	}


function makeRequest(url, zmienna){
if(window.XMLHttpRequest){
	rquest = new XMLHttpRequest();
	}
else if(window.ActiveXObject){
	try	{
		rquest = new ActiveXObject('Msxml2.XMLHTTP');
		}
	catch(e){
		try	{
			rquest = new ActiveXObject('Microsoft.XMLHTTP');
			}
		catch(e){}
		}
	}
if(!rquest){
	alert("Error can't make xml request");
	return false;
	}

rquest.onreadystatechange = changestate;
rquest.open('POST',url);
rquest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
rquest.send(zmienna);
	
}


function changestate(){
if(rquest.readyState===4){
	if(rquest.status===200){
		var json = eval('(' + rquest.responseText + ')');
		document.getElementById('kontener').innerHTML=json.kontener;
		document.getElementById('lng').innerHTML=json.lang;
		document.getElementById('lung').innerHTML=json.lung;
		document.getElementById('start').innerHTML=json.start;
		document.getElementById('oferta').innerHTML=json.oferta;
		document.getElementById('kontakt').innerHTML=json.kontakt;
		document.getElementById('msel').innerHTML=json.menu;
		if(json.menu == 'kontakt')
			document.getElementById('alfred').style.display = 'inline';
		else
			document.getElementById('alfred').style.display = 'none';
		}
	}
}
}