if you do have a network card in that machine, and a decent hard drive, then just use a floppy "distro" (one of the most handy ones is tomsrtbt www.toms.net/rb
- use that floppy to create your partitions (I recommend at least 3: root partition, swap, and any-other-type to store your Slack install files)
- copy your slack files to your 3rd partition
- use the slack boot disk to start the install
- choose your 3rd partition /dev/hda(3 or another #) as the source
- enjoy fresh slack distro on your laptop
I installed Slack the abowe way a few times ... it is a bit lengthy process, compared to just booting from the Slack CD these days.