uniQ is correct. However you can (like you have already done) download the entire tree and nfs/smb/ftp, etc. mount it, making it appear to the boot.iso CD as just another mirror (but faster because it's local - so this may be an effective method if you're doing a mass install).
Otherwise, you have to purcahse Suse 9 as the installer (which Suse has written (yast) has some proprietary licensing caluses of some sort which forbid it to be reproduced (yet you can, just not in a certain form, im guessing ISO).
If you have downloaded the whole Suse9 tree then you have the boot.iso in there somewhere. Burn it and boot it and follow the directions found on suse.com (ftp://ftp.suse.com/pub/suse/i386/current/README.FTP
at the first line, type in the full ftp addr + dir path to the 9.0/ dir. then when it askes again for the path... (usually /pub/suse...etc.) type it in but WITHOUT the / in front of pub. This is a problem they have not noted on there install guide.
Additionally, you may have to load the proper NIC driver for the setup to begin. Since I've always had a gentoo CD laying around I poped that in and did a lsmod to get the driver module and matched it in the listing on the Suse9 CD.