presently i am using the method from
http://www.dynamicdrive.com/dynamicindex9/dyncss.htm

when i need to have a separate css file for windows and mac as sometimes i come across small differences with padding or margins and i have to fix these for mac and pc so i use the method from the above link and it works fine

is this the best method or is there a better and efficient way where in i can have separate css files for a mac and pc

please advice

thanks