function lang(version){
	link = location.href;
	english = "/en/";
	chinese = "/ch/";
	
	
	if (version == "en"){
		link = link.replace (chinese, english);
		parent.location.href = link;
	}else if (version == "ch"){
		link = link.replace (english, chinese);
		parent.location.href = link;
	}
}