Starbuck_II
Explorer
Always tumble checks I guess.From SRD Jump skill entry
So unless specifically noted otherwise, jumping is done as part of a move action.
Also, even if a DM consider that a character can jump as a part of 5-foot step, if a character jumps up 5-foot or more, then he falls down 5-foot or more. At that moment he may provoke AoO.