mini trampoline workouts??

Does anyone know how many calories a trampoline workout can burn? It is not listed on the drop down box that contains various exercises. Also, I'm looking for some good trampoline workouts that run between 30 and 60 minutes and am not having any luck searching on-line. Anyone have any ideas?

I would also be interested in hearing people's experiences using a mini trampoline. Can you really get a good cardio workout? It was an impulse buy as I am sick to death of my ellyptical.

Thanks!!

Vicki