What are your goals? How intense is the cardio? If you're just trying to trim down, do the cardio after.
I see no problem doing some "warm-up" cardio before lifting but if you plan on pushing it, I would save it until after. Otherwise, your lifting could suffer because you've used up too much energy and can't lift to your potential. As a result, you may improve your cardio but won't make any significant muscular gains because you don't have the energy to really "work" your muscles.