I would think that you don't want to do cardio before lifting, because you'd tire your muscles by doing cardio, right? Which would restrict your lifting workout...
I think the most important thing is to do a combination of weights and aerobic activity. I try to do cardio 4-5 times a week and lift 3 times, and that seems to work alright. Also, by lifting weights you increase muscle mass, which would make you burn more calories at rest, which helps with weight loss.
I don't know if getting your heart rate up (to cardio training levels) before lifting makes all that much of a difference, but you DO need to get it up a little, as part of a warm-up/stretch routine.
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