i'm losing gears while car is running!

> hi...hope someone can help..on staturday while driving i stopped @ a
> > 4-way and when i accelerated away it wanted to shift from 2nd to third
> > i just got high revs and the car started coasting to a stop...i can rev
> > it but nothing happens..no gears....weird thing is when i start it up
> > again i can gets gears but after a little while gears drop again and
> > all i can do is just rev....
> >
> > does anybody have any ideas?
>
> its a 1990 accord with 200k miles on it