Adding a new kernel with out removing old one

To add a new kernel with our removing the old ones in linux

Download and extract the new kernel under say /usr/src/kernels folder. Now go the folder
# cd /usr/src/kernels/2.6.18-53
If your current kernel version is same as old one, edit the Makefile to
add some character after "EXTRAVERSION" as EXTRAVERSION= 3x.
# cp .config ..
# make distclean
# cp ../.config .
# make oldconfig
# make
# make modules_install
# make install

This will add new kernel in to the grub.conf list.