I saw your reply regarding the camera settings.
Use ISO 100, the 7.1 F Stop and around 2 - 4 seconds exposure. If it's a little too dark, change the ISO to 200.
Check out the shots I took at the Fireworks championships in Southport.
http://www.digital-forums.com/showthread.php?t=318412. You can see the results you can get with similar settings.
Please feel free to have a look at the EXIF data to see the exposure information etc.
Save an image, right click on the file, go to properties > summary and then advanced. All the info is in there.
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