I have in /etc/grub.conf 
title CentOS_ServerCD-up (2.6.9-42.EL)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-42.EL ro root=/dev/md2
        initrd /initrd-2.6.9-42.EL.img
and in lilo.conf
[root@secure120 boot]# cat /etc/lilo.conf
image=/boot/vmlinuz-2.6.18.1.dn1.p4
        label=2.6.18.1.dn1.p4
        read-only
        root=/dev/md2



if i set in grub.conf 

itle CentOS_ServerCD (2.6.18.1.dn1.p4)
        root (hd0,0)
        kernel /vmlinuz-2.6.18.1.dn1.p4  ro root=/dev/md2
        initrd /2.6.18.1.dn1.p4.img