Collision response

Hi all

I am writing a game and have got to the part where I need to do collision response. I can rotate the object using matricies, I can find the point where a ray intersects a triangle, however I now need to work out what to do with the object after it's collided. I have read the tutorial at http://www.gamasutra.com/view/feature/3427/collision_response_bouncy_.php?page=2 and I am attempting to implement the maths at the bottom of that page.

However, I'm stuck on one point... it tells me to do this

((N.V) * N)

Now N and V are vectors, and the dot (.) product of N and V is obviously a number. How can I multiply a number by a vector (N)?

Any help would be much appreciated,

Thanks for reading,

James

EDIT: PS. what's the tag for inserting URLs in; I tried [url][/url] and that didn't work. What am I missing?