hi i was wanting to delete my log files in 10.5 and i read that they were in the var directory,how do i get there to delete my logs since they are takeing up space.thanks
They are not taking that much space, as they are cleaned with periodic scripts (daily, weekly, monthly).
But to make sure they are clean, I recommend OnyX. http://www.titanium.free.fr/pgs/english.html make sure you pick the correct version (10.5 in this case). It's freeware, and brilliant for maintenance and a lot of other purposes.
If you want to learn about the Unix underside of your Mac, you can run Terminal. It's an application in /Applications/Utilities/. The Unix shell is very powerful but also complex. You'll want to read a guide to Unix. There are free guides online as well as books you can buy. Be careful, though, because you could accidentally delete important files.