howto put /tmp partition into /md0

[adslvmlg at tpg.com.au]

Hi guys,
Has any tuned their freebsd to put the /tmp partition into the memory disk?
I have followed the procedures on this url, but no luck to get it working.

http://www.onlamp.com/pub/a/onlamp/excerpt/BSDHacks_chap1/index.html?page=2

Can some one please point me to a detailed article or some other howtos?

ps: please cc me to this email address, because I am not registered in this list.

Thanks.

Regards,
LEI CHEN