How to make Time Machine start as soon as connected?

Hey guys!
DOes anyone know how to get time machine to start backing up as soon as the drives connected? my old mbp running 10.5 used to start backing up immediatly but my new mbp and 10.6.1 doesnt seem to start until i click "back up now" from the menu bar!

Well... thats just stupid lol thanks for the help though!!! Snow leopards really being annoying with this bug and the DNS internet issues after sleeping! ARGH