english = "/eng/";
chinese = "/chi/"

function tran_b5(){
	link = top.location.href;
	if (link.indexOf(english) != -1){
		link = link.replace(english,chinese); 	
	}
	top.location.href=link;
}

function tran_en(){
	link = top.location.href;
	if (link.indexOf(chinese) != -1){
		link = link.replace(chinese,english); 	
	}
	top.location.href=link;
}