Thanks for that everyone
I thought it may be the case that I couldn't use a square format but I guess it was worth asking.
I have an apple laptop with iPhoto on it and I've found a very simple way to crop my pictures, repeating the same crop on all the photos that I upload.
The reason I wanted to do it in camera was to avoid Post Processing cropping. I much prefer to take the photos that I want and not do any editing work on the computer because of the time involved just doing the site on its own, let alone having to do extra work to the photos. I'm not looking for more MPs per shot as I shot in raw and I am happy with the result of the cropped photo quality.
I like the Yashica idea but it just wouldn't work in the fast world we live in today (sad isn't it)
At the end of the day throughout my photographic life I've always strived to take photos in a fast efficient manner, filling the frame with what I want on the photo. That was in the film day's, and. today I don't see why it should be any different with a digital camera, but having said that I can't afford a square format digital so I'll just have to carry on the way I do it now cos I can't see my brother buying me another camera, still, I can live in hope.
Len