This site was posted in the comments but the link was a little bit wrong. It gives the breakdown of the things that have to happen for the Titans to get in. As you can see from case #2 it doesn't necessarily mean it is over if the Jets win tonight. It makes things a little more likely if they do though. It would be pretty funny if the Titans ended up playing the Patriots 2 weeks in a row which could happen.
I still haven't had a chance to watch the game all the way through but the most important thing right now are the playoff hopes.