main-text links using CSS?

I'm trying to emulate something similar to text/links in this page: http://chriscmerritt.com/

but the way I would normally do it would be to stick the hrefs in the text itself, whereas I think the designer of the above page has got a CSS technique which allows him to write the text then list the hrefs beneath which somehow activate the desired text to become links and be of a different colour - so I wondered if anyone knows how this might be done.
If I'm not making myself clear then check out the sourcecode on his page

been racking my brains all day but not getting anywhere!!?!

many thanks
J