If you're careful you can prop it up with tooth pics etc... I've used a small net pot with the bottom cut out to 'corral' a seedling like a tomato cage... Usually if you can get it standing back up with support within a day or two its often able to stand on it's own if it's not too stretchy...
yeah, what burnin said. bury the stem atleast half if not more, watch for over watering as this will cause them to fall over, so will under watering though LOL