[arch-general] How to create archlinux install CD?

I have a new i586 machine and want to install archlinux i586 on it. So I want to recreate the archlinux install CD. But how do i do it? I have unpacked the install ISO, and is replacing all the packages, but when it comes to inird.img, the instructions in the wiki do not work. I cannot mount the unzipped inird.img. What should I do? file say that it is a cpio archive, but how do I unpack and mount it? And then, what is lowcore.img? Of course I could do it by booting debian, or something, and then replacing it with archlinux, but actually having an archlinux install CD would be pretty handy for my i586 machines.