The problem is sometimes the large popup image can only be seen half, the other half is below the screen. Is there a way to let the popup image always appear full inside the screen area?
The pop up image is usually placed relative to the link so you can't really automate the process if you have links in odd places. You would just have to ensure that the images are not too big or that method isn't really useful unless you have a fixed width and height to work with.
If you have a fixed width and height container you could place an image in the same place as in the gallery demo on this page.
However it sounds like you want something more dynamic and you would be better off with a lightbox type of effect.
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