In the Jan-Feb 2012 edition of Backpack Magazine, I have an article about talking to your teens about suicide. It's on p. 25. This article was one of the hardest things I ever wrote, and I'm really proud of it. One of my friends had the courage to tell her story. We were friends when she attempted suicide, and I had no idea she was considering it until she did.
Secondly, when I was 17. I was suicidal myself. I tried swallowing a bunch of pills, but my stomach rebelled. It gets better. It's hard to see that when you're mired in despair, but it gets better.