Redirect based on referrer URL

Question

In my site I have a password protected page containing some links to other sites also operated by myself that cannot be password protected. I would like to place a HTML code

Answer 1

I found document.referrer doesn't work for me, but location.href works:

if (location.href != "http://yoursite/index.html") {
    location.replace("http://yoursite/index.html");
}