Oh no! That is one of my worst fears!!!! Maybe you could try a taller baby gate, with a swinging door, so that you won't have to step over it. That way you would have like an extra catch whenever anyone goes in or out.
Maybe something like this:
http://www.petstreetmall.com/pet-gate.aspx
look at the "Duragate" one as you scroll down the page.
Good luck!!!!