Shoutbox

Remember that it's not your job to solve their problems. I know it's sucky because you suffer the consequences, but it's their problem and they have to solve it.

All you can do is be open to them and tell them your worries and let them know how they make you feel. Other than that, as suggested before, try to find someone closer to home than a forum to talk to, possibly a professional if you're really having problems with this, or if your parents might split up at one point.

What I personally did as my parents had a go at each other verbally, was go for a walk if it's not too late or make sure I couldn't hear them.  It's not a good idea to interfere with arguing people, so if you try to talk to them, make sure you do so at a "neutral" time when they're calm and not fighting.

Lastly, don't forget that it's likely they don't like fighting as well and already feel pretty bad by it all too. They're not doing this to hurt you.