Very nice pics Howard. I always found Fireworks to be very difficult to take pics of.
(of course i am assuming your camera is a slightly better quality piece of picture taking equiptment than my camera phone.) :)
The trick is a tripod and keep the shutter open for several seconds. Most of these were shot at 15 seconds. That's how you get multiple bursts in one frame.
Of course, you've got to have a camera that lets you control shutter speed.