Middle and right brake lights not working

I have a 91 Accord and the middle and right brake lights aren't working. I read somewhere that it's probably the grounds or some failure module acting up. The left lights work fine. Any ideas? I don't have much experience with this sort of stuff and I need the lights functioning by Sunday.

This has been discussed recently. Do a search on this site and read up on the possible solution and then get back to us with questions.