It sounds like you may have broken a mounting bracket. Look under the seat and see if the brackets that mount it to the floor are broken. If they are and you can weld you might be able to take it out and fix it. I had a front bracket break in my old jeep wrangler when I was out 4wheelin. I took had a friend that could weld and we took the seat out and cut a piece of metal that we could use to brace it, and welded it all together. Mine had broken off right at the weld. Another common thing I have seen is the bolts will pull out of the floorpanel. If that's true just weld a new piece in and drill it out to accept the bolts. Even if you can' weld, a welding shop wouldn't charge you much if you take the stuff apart and get it preped for them. Good luck.
2000 Convertible V6 Oklahoma Sooners Red "Civic Kid Eater" Why is it that only kids in Hondas wanna race?