function chLang() {
	var link = parent.location.href;
	var endLink = link.length;
	var i;
	var n;
	var found = 0;
	
	for(i = 0; i <= endLink; i++) {
		n = i + 3;
		if (link.substring(i, n) == "eng") {			
			chLink = link.substring(0, i) + "chi" + link.substring(n, endLink);
			break;
		}
	}
	parent.location.href = chLink;
}