Download the packages from the link above. Open up a terminal (in KDE use "konsole"), cd to the directory you downloaded the .tgz files to and issue:
Code:
su -c "installpkg libdvdcss-1.2.8-i686-3dl.tgz libdvdnav-0.1.10-i686-2dl.tgz libdvdread-0.9.4-i686-3dl.tgz"
You'll be prompted for the root password.