If you or someone you know is suicidal, please refer them to this number 1 (800) 273-8255 - National Suicide Prevention Lifeline or http://www.suicide.org/international-suicide-hotlines.html We are not trained professionals. Other crisis prevention links can be found below.

Online Crisis Prevention

http://www.crisischat.org - online chat service of the National Suicide Prevention Lifeline. (US only)
http://www.befrienders.org - International volunteer action to prevent suicide. BONUS: local helpline by country!
http://www.7cupsoftea.com - Free, anonymous, and confidential conversations with trained active listeners.
https://www.imalive.org/ - Online chat network of volunteers trained in crisis intervention.

About calling a suicide hotline: http://www.reddit.com/r/SWResources/comments/1c7ntr/suicide_hotline_faqs/
Tips for speaking with suicidal people: http://www.reddit.com/r/SWResources/comments/igh87/concerned_but_dont_know_what_to_say_here_are_some/