Flash Detection Scripts question

hi…Sorry if the answer to this might be painfully obvious, but I just need to fully get it…I was reading about this script, here:
and I wondered if the script needs to be placed on all of the FLASH pages?
Or just the index.html page…The main index page (index.html) currently has a redirect to the nonflash index page(indexnf.html).
So that taking the user automatically to the nonflash index page, where do they go from there when they click on buttons?

Thanks in advance for any help!