DO -Gently and repetitively place puppy's feet back on the floor and reward him there.
-Be consistent.
-Get down to his level to give affection and attention.
DON'T -Do not allow the pup to jump up. Do not pet, talk, cuddle or reward him for jumping.
-Do not give in!
-Do not allow other people to let him jump on them.
-Do not give up!
Check here for more information on jumping.