Join Date: Apr 2006
Location: Central Ohio
Bikes: Two brand-less build-ups.
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Most likely at least here in the US, you have tubes fitted with Presta valves (the top of the valve looks like a series of stacked parts, each smaller than the one below). Most automotive-type valves are Schrader (top of the valve is pretty much flat right across.).
You can either go get a bicycle air pump (most will handle either type of valve), or pick up a few cheap presta-to-schrader adapters. Most bike shops around here have them for around $1 each.
If you aren't in the US, I'm not sure what you may have. I know there is a 3rd type of valve, but it's rare here and I've never had direct experience with it.