Simple folder structure question

[Rightz]

I have a website:

www.example.com

and a page:

www.example.com/a/a.html

On a.html I want to link to:

www.example.com/b.html

Whats the easy way to do this? I know its something like

../b.html

What links to the home directory?
What links to the folder before the one you're in?

Thanks

[jatar_k]

maybe this thread will offer some info
Relative or Absolute [webmasterworld.com]