leaking oil

I was just wondering if it was easy to fix a oil leak on a 99 Kia Sportage. My brothers car is making really bad oil leak spills on my parents drive way and was wondering what to do to fix it. Thanks.

Valve cover leaks are well known on the DOHC but in fact, you must find WHAT oil you have a problem with: transmission? front/rear differential, power steering,engine ? Valve cover leaks are also known to invade the spark plug/coil area so if you work on that, do it with caution.