function loadBi() {
	url=document.location.href;
	if (url.match("mango.cc/eng")) { 
		url=url.replace("mango.cc/eng", "mango.cc/chi");
	} else {
		url=url.replace("mango.cc/chi", "mango.cc/eng");
	}

 	window.location=url;
	return true;
}