Thanks for the suggestions!
Unfortunately that wasn't exactly what I was looking for, which is in no way your fault as my initial post was unclear.
I guess I should also say what it is I want to exactly achieve.
My site has been up for more than a year, many posts and pages have been added on to the site. I have recently added a new page and I would like only that page to have commenting enabled. On the older versions of wordpress you could just uncheck "allow people to post comments in articles" and just individually enable commenting on the posts/pages that I want as I add them to the site. With 2.8.5 it appears that I cannot do that, and I doubt the only solution is to manually disable comments on all of my previous pages and posts.
Reading your post again mercime your solution may work for me, just that my php knowledge is quite basic and I will need some guidance as to what the instructions mean and such.