in simple words, run (as root):
mkinitrd 2.4.22-new.img 2.4.22
then open lilo.conf or grub.conf
copy the lines that talk about the name, kernel, image:
lilo.conf looks like
Code:
image=/boot/vmlinuz-2.4.0-0.43.6
label=linux
initrd=/boot/initrd-2.4.0-0.43.6.img
read-only
root=/dev/hda5
grub.conf looks like
Code:
title Red Hat Linux (2.4.22-10)
root (hd0,1)
kernel /vmlinuz-2.4.22-10 ro root=/dev/hda3 hdc=ide-scsi
initrd /initrd-2.4.22-10.img
paste these lines as new entries, changing the label/title and the initrd file name.
if you have lilo run /sbin/lilo
then restart and use the new entry
best of luck