function chLang(lang) {
	var currentPath=location.href.toString();
	var switchTc='/chi/';
	var switchEn='/eng/';
	var switchSc = '/gbx/';
	lang = '/'+lang+'/';

	switch (lang){
		case '/gbx/':
			currentPath=currentPath.replace(switchTc, switchSc);
			currentPath=currentPath.replace(switchEn, switchSc);
			break;
		case '/eng/':
			currentPath=currentPath.replace(switchTc, switchEn);
			currentPath=currentPath.replace(switchSc, switchEn);
			break;
		case '/chi/':
			currentPath=currentPath.replace(switchEn, switchTc);
			currentPath=currentPath.replace(switchSc, switchTc);
			break;
		default:
	}

	document.location=currentPath;
}