Hi!
First of all I want to say how much respect I have for you and how wonderful I think it is that you want to help your friend. Watching someone turn into a skeleton is not an easy thing to do, especially when you know you are completely helpless and that you can do nothing to stop them.
As for the URL's Roxy's right we can't post those here, we can't encourage this type of behavior, even though you're using them for a good cause. It's actually a good idea to try and block them from her computer, however, if she found out you did this it might hurt her even more. Like you were trying to sabatoge her "diet" or something. If she has not come to grips with the fact that she has an ED, it's very difficult to get her to understand that she needs help. (even once she does accept her ED, it's very difficult to get help)
Good luck---my only advice is DON'T LEAVE HER. This does not work. Sometimes people think that if they leave in protest it will help snap the person into making smarter decisions...this doesn't work. "tough love" only rips the person apart even more. IMO, of course.
GOOD LUCK TO YOU AND YOUR FRIEND and I sincerely hope she realizes how serious ED's are before she's in too deep. Let us know how you're doing, ok?

And remember, there's always hope.
NEVER GIVE UP
~sarah~