function chLang(lang) {
	var l = new String(document.location);
	var chLink = '';
	var n = -1;

	if (l.indexOf('/eng/') >= 0) {
		n = l.indexOf('/eng/');
		chLink = l.substring(0, n) + '/' + lang + '/' + l.substring(n + 5, l.length);
	} else if (l.indexOf('/chi/') >= 0) {
		n = l.indexOf('/chi/');
		chLink = l.substring(0, n) + '/' + lang + '/' + l.substring(n + 5, l.length);
	}
	if (chLink != '') document.location = chLink;
}