function clang(lang) {
	fpath = parent.window.location + ""
	if (lang == null) {
		if (fpath.indexOf("/b5/") != -1) {
			fpath = fpath.replace(/\/b5\//, "/en/")
		}
		else {
			fpath = fpath.replace(/\/en\//, "/b5/")
		}
		parent.window.location.href = fpath
	}
	else {
		if (fpath.indexOf("/en/") != -1) {
			searchstring = "/en/"
		}
		if (fpath.indexOf("/b5/") != -1) {
			searchstring = "/b5/"
		}
		replacestring = "/" + lang + "/"
		fpath = fpath.replace(searchstring, replacestring)
		parent.window.location.href = (fpath.indexOf("?")==-1 ? fpath : fpath.substring(0,fpath.indexOf("?"))) +"?"+lang
	}
}