Yes, virtually all modern cameras allow one to set the size of the stored image. 800 x 600 is a typical setting.
However, it's wise to save images in the largest size possible in your camera and computer so that, should you ever need to blow them up, the detail will still be there. There are numerous free third party programs available to resize photos for use on forums. My favorite is FastStone...
FastStone Photo Resizer - Powerful Image Converter/Resizer
It can do lots of other stuff like renaming and adding watermarks.
If you store images intended for forums on Photobucket they will be re-sized automatically when uploaded.

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