need help...broken timing belt???

I think that I broke my timing belt tonight. I'm not really worried about changing it. I'm worried because I don't know if a B2200 is an interferance motor. Do you all know?

Also, this thing wants to idle at 1500. It runs fine, but just idles too high. Any ideas. I'm new to Mazdas. This is a B2200 Xcab that I've had about 2 weeks. It's an auto, if it matters. Thanks guys.