Kernel upgrade failed how to boot to old kernel Urgent Please

hi,
a kernel upgrade to vers. 2.6.10 failed and teh server doesnt' come back online. I cna hoever access via SSH. How can i go back to the last kernel??
i have the grub.conf the following way as belw. what do i need to change to boot into teh old kernel?
Please help its' urgent.

thanks a lot
--------
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/hda2
# initrd /initrd-version.img
#boot=/dev/hda
default=0
timeout=1000
splashimage=(hd0,0)/grub/splash.xpm.gz
title CentOS (2.6.10)
root (hd0,0)
kernel /vmlinuz-2.6.10 ro root=/dev/hda2
initrd /initrd-2.6.10.img
title CentOS (2.4.21-27.0.1.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-27.0.1.EL ro root=LABEL=/
initrd /initrd-2.4.21-27.0.1.EL.img
title CentOS (2.4.21-27.0.1.ELsmp)
root (hd0,0)
kernel /vmlinuz-2.4.21-27.0.1.ELsmp ro root=LABEL=/
initrd /initrd-2.4.21-27.0.1.ELsmp.img
title CentOS (2.4.21-20.0.1.ELsmp)
root (hd0,0)
kernel /vmlinuz-2.4.21-20.0.1.ELsmp ro root=LABEL=/
initrd /initrd-2.4.21-20.0.1.ELsmp.img
title CentOS (2.4.21-20.0.1.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-20.0.1.EL ro root=LABEL=/
initrd /initrd-2.4.21-20.0.1.EL.img
title CentOS-3 (2.4.21-9.0.1.EL.c0smp)
root (hd0,0)
kernel /vmlinuz-2.4.21-9.0.1.EL.c0smp ro root=LABEL=/
initrd /initrd-2.4.21-9.0.1.EL.c0smp.img
title CentOS-3-up (2.4.21-9.0.1.EL.c0)
root (hd0,0)
kernel /vmlinuz-2.4.21-9.0.1.EL.c0 ro root=LABEL=/

 

 

 

 

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