function chlang() {
	var menu = parent.menu.location.href;
	var footer = parent.footer.location.href;
	var main = parent.main.location.href;
	var endmenu = menu.length;
	var endfooter = footer.length;
	var endmain = main.length;
	var i;
	var n;
	var found = 0;
	
	for(i = 0; i <= endfooter; i++) {
		n = i + 3;
		if (footer.substring(i, n) == "eng") {			
			chfooter = footer.substring(0, i) + "chi" + footer.substring(n, endfooter);
			chmenu = menu.substring(0, i) + "chi" + menu.substring(n, endmenu);
			chmain = main.substring(0, i) + "chi" + main.substring(n, endmain);

			break;
		}
	}
	
	parent.menu.location.href = chmenu;
	parent.footer.location.href = chfooter;
	parent.main.location.href = chmain;
}