function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}


///////////////////////////

function zmianaLang(lang_z) {
createCookie('lng', lang_z, +30)
}









///////////////////////////////


function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}


////////////////////







var lng = readCookie('lng');
if(!lng){ 
//var langcodes=["pl", "es"];
var langcodes=["pl", "en", "de", "cz", "sk"];
var langCode = navigator.language || navigator.systemLanguage;
var lang = langCode.toLowerCase();
lang = lang.substr(0,2);
for (i=langcodes.length-1;i >= 0; i--){
if (lang==langcodes[i]){
var lng = lang;
}
}
if(lng!=lang){ var lng = 'pl'; } // podstawowy język 
createCookie('lng', lng, +30);
 }