function swapEng(){
	var tr = window.location.pathname;
	len = tr.length;
	rs = 0; 
	var filename;
	for (i = len; i > 0; i--) { 
		vb = tr.substring(i,i+1);
		if (vb == "/" && rs == 0) { 
			filename = tr.substring(i+1,len);
			rs = 1;
		}
	} 
	window.location.href = "../en/"+filename;
}

function swapTChi(){
	var tr = window.location.pathname;
	len = tr.length;
	rs = 0; 
	var filename;
	for (i = len; i > 0; i--) { 
		vb = tr.substring(i,i+1);
		if (vb == "/" && rs == 0) { 
			filename = tr.substring(i+1,len);
			rs = 1;
		} 
	} 
	window.location.href = "../chi/"+filename;
}
function swapSChi(){
	var tr = window.location.pathname;
	len = tr.length;
	rs = 0; 
	var filename;
	for (i = len; i > 0; i--) { 
		vb = tr.substring(i,i+1);
		if (vb == "/" && rs == 0) { 
			filename = tr.substring(i+1,len);
			rs = 1;
		} 
	} 
	window.location.href = "../sim/"+filename;
}