Oil in 2 and 3 cylinders. Help Please.
 

I am a new member and owner of a 2005 mazda3 hatchback. I just replaced the sparks plugs this weekend to the original OEM specification. I noticed that I had a large amount of oil on plugs 2 and 3. Anyone have this problem? I'm assuming a valve cover gasket. Didn't find any info on the search board. Thanks in advance.