" i removed all of my linux paritions, rewrote the MBR and booted to windows. "
If you actually removed your Linux partitions then you nede to recreate the Linux partitions and do a complete install. If you mean that you no longer have the lilo menu that allows you to boot into Linux because you rewrote the MBR then read on.
"So i need an alternative way to install LILO without going into linux (boot disk, etc)"
Boot your Slackware install CD into rescue mode. Mount your Linux partition (I assume that it is on /dev/hda3 and that it is an ext3 partition). Then chroot to Slackware.
mount -t ext3 /dev/hda3 /hamster
When you are in your Slackware system then you can install lilo using malg0rath's instructions.
Be prepared. Create a LifeBoat CD.