function changeLang(lang, url) {
	if ( ! url ) {
		url = document.location.href;
	}
	var newURL = url.replace(/\/(de|en|bg)\//, '/' + lang + '/');
	if ( ! newURL.match(/\/(de|en|bg)\//) ) {
		newURL = newURL + lang + '/';
	}
	document.location.href = newURL;
	return void(0);
}