Actually, this is a really good way of resizing photos, never actually realised you could do it in paint. There's only one drawback, it doesn't actually work in pixels, just percentage. However, I don't think this really matters. I have added a photo that you can work by. Try not to get any bigger than one below. What I did with the photo below is actually open up the picture in paint. It had come straight from my digital camera and hadn't been resized at all. I think it was around 3 MB and around 3000 pixels in size. Obviously this is far too big for a forum. I made it 15% which brought it down to around 460 pixels wide and around 35 kb in size. If you are not computer literate, this will probably mean nothing to you
Thanks to dinger for pointing out that paint is an extremely good way of resizing photos.