function getOsLanguage () {
    var Lng;
    var Alllang = new Array('EN','FR','RU');
	if (readCookie('nrcLang')==null) { //check for cookie presence
		if(window.navigator.userLanguage==undefined){
			Lng = window.navigator.language.substr(0,2).toUpperCase();
		}else{
			Lng = window.navigator.userLanguage.substr(0,2).toUpperCase();
		}
	}else{
		Lng = readCookie('nrcLang');
		return Lng;
	}
	found = false;
	for (i=0; i<Alllang.length; i++){if (Lng == Alllang[i]){found = true;}}
	if (found) { 
		createCookie('nrcLang',Lng,356);
		return Lng;
		}else{
		return "EN";	
	}
}

// manage Cookies
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 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;
}

function eraseCookie(name)
{
	createCookie(name,"",-1);
}