Cardio, Before Or After Lifting?

[blueray4]

I'm trying to lose the fat's getting in the way of my chiseledness. I really like to use the row machines and low impact machines. What are the advantages/disadvantages, or are there none? I really don't do anything to warmup besides stretch. I usually do cardio at the end of my workout, but I was thinking, would doing it before increase the effectiveness of my muscle gain?

 

[Protobuilder]

After.

Lift. Maybe take a bit of protein. Maybe wait 15 minutes. Cardio.