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.... but there is no earthly reason why a photo on a website should be that large.
Unless its a Google maps type site Gary. I should imagine its done in a very similar way. When you zoom in on an image on Google maps it's not a single hi-res image you're zooming in on, it's a series of smaller images tiling on the screen. You can see this if you zoom in on jebs images and right click / view image. At the varying zoom factors you're not viewing the same image but progressively reduced sized images which are tiled on the screen (which you did mention).