initrd or initramfs ... etc.

[r_burton]

I am running Fedora-14-x86_64
I have imported, and built kernel source: linux-2.6.38.6

My problem: How do I build a new 'initrd'?

I have examined the file /boot/initramfs-2.6.35.6-45.fc14.x86_64.img

Which comes with the Fedora-14 distribution.  How do I build a new
one?  On other distributions which I am familiar (e.g. Suse) there is
a script, 'mkinitrd'.  Is there such a script for Fedora?  Is there
a definitive "Guide to the Fedora Kernel Build Procedure"?
Thanks
Bob