swing eighth notes in sound output?

[Niki Pantelias]

  Hi everyone,

  I'm a new user working on some jazz arrangements using LilyPond, and 
would like to get lily to understand "swing" eighths -- i.e, handle the 
music so that regular eighth notes appear in the paper output, but in the 
sound file, these are played with a "triplet" feel.  Does anyone know if 
there is a way to do this?

  thanks,
  -- Niki