function changeLanguage(obj) {
	var url = document.URL;
	var re = re = /[?&]lang_id=[^&]*/;
	url = url.replace(re, "");
	if (url.indexOf("?") > -1) {
		url += "&lang_id=" + obj.value;
	} else {
		url += "?lang_id=" + obj.value;
	}
	location.href = url;
}