parallel port valve controler

Or something like that. Bear with me, I'm a software kinda guy.

I've got eight valves I would like to put under computer control.
These valves are 12 volt DC latching (pulse). Or so they say on their
labels. I do know that there is a black wire and a red wire comming
out of them. If I put a red wire on the postive terminal of a battery
and the black one on the negative terminal, the valve will open. If I
reverse the wires, the valve will close.

I'd like to find something that will control these valves via the
parallel port on an old pc. What I would like to find is some like
store.qkits.com/moreinfo.cfm/QK165
but that will able to reverse the polarity of the signals.
--
Frank Stutzman

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