Hi, gilj,
What software are you using? If you have XP, you should have MS Picture Manager, which has a section on reducing size for internet transmission. If you have Photoshop, you can make the picture any byte size you want. Most pics from the camera are in the megabyte range, but you can get very good pics posted in the 100 kilobyte range or less. They will upload and download faster, too.
Jim