2001 Dodge Neon - Oil Problems

I have a 2001 Dodge Neon and noticed that sometimes when I'd start it that it would blow white smoke out of the tale pipe then after it that would not show any more signs of smoking when driven. I looked at the engine and upon insepecting the engine I noticed that their is oil on the spark plugs and wires on cylnders 3 and 4. I had would like to know if the problem is a seal somewhere and how I would go about fixing it. Is it possible for me to fix? The car runs ok, is it safe to drive if I can't fix it and need to get it repaired? If I have someone do the job how much do expect it to cost? By the way I have a somewhat above average knowledge of cars: I have replaced brakes(front and rear), radiators, done tune-ups, and even replaced the valve cover gaskets on my brothers 1994 Dodge minivan.

Thanks in advance for helping me!!