I use Linkadmin v1.0.
Located here:
http://usefulscripts.com/
It links exactly how you want it so that SE spiders can follow the links and improve page ranking.
I think it is written by the same richard from richard's realm. Not quite sure, but the features are great.
Richard's a cool guy too. After installing it on our server, we had to move hosting companies and he reinstalled it again without any extra charge
check it out