All though not hard to get a shot like this, you do need to plan it. Because of the lack of ambiant light the meter reading will not be able to handle it and most smaller digital camera unfortunatly rely on the flash. Set your camera to Manual with a small aperture setting, small as you can get say f16/f8 put the shuter speed to 2 or 3 seconds if you can.Do not use flash. You do need a tripod other wise you will end up with just a blur . With these setting you will capture the ambiant light as well as the brighter lights of the fire works admitedly the fire works will be as above long streaks of light.
The shot above was taken with a 300mm lens at f16 I fired of the shutter on B (Bulb)which kepted the shutter open as I followed the rocket up mid launch the firework did the rest as it exploded, then released the shutter. simple.

This night shot of Bedford Bridge was also taken with an f22 aperture and 4 second exposure, what you cannot see is the rower that crossed the screen from left to right although you can see the ripples he caused.
Another one of Trafalgar Sq
Regards 4D
[Edited on 30-6-2005 by Fordie]