I would personally recommend cardio after a workout, your first energy system used it ATP and Creatine Phosphte which is used for the short burst of lifting (as in weight lifting), if you do cardio previous to your weight lifting you will use your first energy source as in your CP, therefor you will have less energy for weight lifting. Now unless your diet is very bad you will not lose muscle of course, but if you have a normal diet that consists of proteins, carbs, etc then you will still have fine results if you start with cardio. I hope this helps, I start with weights everyday, and if I feel like having a bit of extra energy after a couple hours of weights I run a bit.
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