OIly leak Advice needed!!!

[Pjc2480]

Hi All, I am brand new to this site and a complete novice so all advice welcome.
I have a FZ6 Fazer which I have owned since April this year. It has 7700 on the clock and runs beautifully but I have notice some leakage coming out of the overflow pipes on the off side. I think that the liquid leaking is coming from the middle overflow pipe and is slightly oily and smells of petrol. Over the course of the day the patch is about 50mm diameter and is only very minor, but is anyone aware of this and what is the potential cause?  The leak is not continous and all the overflow pipes seam dry. I think it is when I turn up to the office and it must happen soon after arriving. I know this might be minor so just looking for so basic advice and reassurance.  MANY THANKS.  

[ddtwelve]

Petrol tank breather tube mines the same

[Pjc2480]

Nothing to worry about then?  This is obviously quite standard i presume. Thanks for your help with that.  Cheers