hi Kathy,
Jazz is a very general term which includes Jazz Funk, Street Jazz, Pop Jazz.
Jazz Funk, Street Jazz and Pop Jazz are different terms used to talk about the same kind of dance: Jazz with some Hip Hop, sometimes commercial type of dance.
Modern Jazz (Mainland people call it New Jazz) emphasizes the "new" style of dance. It's usually the type of dance you see onMTV. So Modern Jazz can refer to Jazz Funk, Street Jazz and Pop Jazz.
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Kenny
Friends Junction Dance Crew
http://hk.myblog.yahoo.com/friends_junction_dance_crew