Small oil leak

[PaulZX]

I've noticed a bit of oil coming from under the right-front side of the spark plug cover. There's not a lot, but does anyone have any idea where it's coming from, or has anyone had a leak like this before?

http://i43.tinypic.com/4t5b1g.jpg

Thanks in advance.....

[abdul]

could possibley come from oil filler cap seal