var currentLang;
function lng_change(lang) {
	if(currentLang==null && currentLang==undefined)
		return;
		
	var citem  = document.getElementById('fo_'+currentLang);
	if(citem==null && citem==undefined)
		return;
		
	var nitem  = document.getElementById('fo_'+lang);
	if(nitem==null && nitem==undefined)
		return;
		
	currentLang=lang;
	
	citem.style.visibility="hidden";
	citem.style.display="none";

	nitem.style.display="block";
	nitem.style.visibility="visible";
	
	return;
}