If you accidentally ate something you are still considered vegetarian. Accidents happen they're part of life as long as it wasn't intentional i wouldn't worry about it.

As far as i know kosher gelatin is still non vegetarian. Though you can get vegetarian gelatin, well something similar. It's worth asking in your local health food shop.

Also in future you'll probably get more responses if you goto http://www.veggieboards.com They have a teen section which is or was attached to this site ( vegetarianteen.com).

Just because you sliped once doesnt make you an none-vegetarian. ANd I am not sure about the kosher thing because I am a Pagan, not a Jew. And not all geletin is made from boiled pig skins and cows hoofs, you can find some vegetarian geletin based products, LIKE TOFUTII!! TOFUTI IS AWESOME. I thought I would hate tofu... just look at the name BUT ITS AWESOME!