i decided to mess around with time machine and use my little 75GB external drive. i set up time machine to pretty much just back up my portfolio folder, my applications folder and some other stuff. it did it's initial back up and has been performing it's scheduled backups and everything but when i go to the folders that time machine backs up, i don't see any button or anything to get the time machine display of the folder. how do i get that to come up??