audio volume/levels

I am making a slide show with mostly still photo's and background music.
However, I do have one short video clip I'd like to insert. I have done that
with no problem but I would like to be able to lower the volume of my
background music so that my video sound will stand out. But, I only want to
lower the background music during this one short clip and then I want it to
increase back up to where it was before. Is there a way to do this?

Thanks