[CentOS] Redhat CD with kickstart file

Hi,

I am trying to create a custom iso that I can use to install machines.  
I want to include my custom kickstart file on the distro and when its  
put in get the system to build using it.

I have done some reading about this process, but i still havent been  
able to get it working with out any problems.

I have ripped the contents of the iso by mounting it on a loop back device.

I then put my kickstart file names ks.cfg into /isolinux/ on the ripped cd.

I then use mkisofs to recreate the iso, but every time i boot from it  
i get either "unknown keyword in config file", "could not find kernel  
image: linux" or "invalid or corrupt kernel image" error messages.

Has anyone got a step by step guid to how to do this as this is  
driving me nuts!

Hope someone can help.

Thankyou!