ok il admit im new to RST's so apologise for my amateur question but can anybody narrow down what may be causing this oil leak...

here is a picture...

http://tinypic.com/e7l05u.jpg


its hard to see from the pic but oil is dripping directly onto the exhaust.

this is annoying as its:

a)dripping onto the garage floor and making a mess

b)dripping onto a sometimes extremely hot exhaust causing it to smoke!

it has recently had the sump gasket replaced by the local garage and this leak started soon after this....

any help would be much appreciated!