I thought is was something like this:
yourwebsite.com/pub/sub/sub2/yourpage.html to yourwebsite.com/pub/yourotherpage.html
You would want to, at yourpage.html, creat a link that has the following: ../yourotherpage.html (each . goes down a directory?)
Correct me if I'm wrong, but I believe this is how my HTML editor parses links...