Nikon SLR Cameras

Is it possible to have a external microphone if the camera doesn't have a mic input?

Funny
Funny

I have brought a Nikon D3100 mainly because so i can make good videos, but however there's no mic input and i was really down when i noticed this. But i came across this shotgun mic on amazon and it said its compatible with the Nikon D3100 but i'm not sure it is
please can you tell me if it can connect the the camera
if not then can you tell me a mic you can put on a DSLR camera without a mic input
here is the link
http://www.amazon.co.uk/...005UELXVQ/

ender
ender

If it says it is compatible, it is. It likely plugs into the port for a data cable.