ATI drivers are a pain to install.. be forewarned these are very hard for a newb to get working in most cases... First of all you need a suported card.. which means the driver only works with a Radeon 8500 and up.
To install, do the following..
download the driver from ATI (you have already done this
)
su -
password: # put in roots password
urpmi kernel-source # you may need to insert one of the mandrake cd's
rpm -i --force fglrx-whatever.rpm #this should build the modules, if you get any errors post them up we can work them out you do not have to worry about the "tainted kernel" error.
fglrxconfig # this will run you though the config process most of the defaults will be fine but read everything. there will be a section that asks if you want to use internal or external agpgart, read the uestion carefully and make sure you choose to use EXTERNAL AGPGART
next,
modprobe fglrx #post any errors you may get, if you get none.. continue on to see if this will work,
press cntl+alt+backspace this will restart the xserver, if all goes well it will come right back up... if it does come back up do the following...
fglrxinfo # if this reads MESA, you have problems post up if so, if it reads ATI you are good to do the following...
edit /etc/modules.preload # i think that is the file, all you need to do is add fglrx into the file. and you are set to use the ati driver..
for the mouse.. im not exactly sure about that one.. but you will need to edit /etc/X11/CF86Config-4 you will probably need the line "Option ZAxisMapping "6 7" added to your mouse section though.