Facebook unsecure question?

Hello. On the web address bar, there is a little lock with a caution sign over it and when I click on it I get this >> a href="http://tinypic.com/r/2506oht/7" rel="nofollow"http://tinypic.com/r/2506oht/7/a How can I fix this?? I want it to be secure!! I don't want some "attacker" getting into my Facebook! PLEASE HELP :(