If you are keen just to upgrade your kernel the easiest thing is to get a RPM kernel for your distro, but if you really want to compile from source read on... :-)

Along with this i will be very thankfull if u can kindly explain me the kernal compilation process(i want to compile a new kernal)

http://www.freeos.com/articles/4794/

Download a vannilla kernel from http://www.kernel.org/ (click on the F) or ftp://glug-nith.org/tarballs/linux-2.6.17.11.tar.bz2 or ftp://glug-nith.org/tarballs/linux-2.4.32.tar.bz2 depending on whether you want the 2.4 or 2.6 branch. If you are using a distro as old as RH9 then you should try the 2.4 kernel.

Unzip the tarball and after cding into the directory type: # make help

That would show you all your available options. But follow the tutorial for your first attenpt.

Cheers, Debarshi