See through a background of a Table to the background of site
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This is hard to explain, but I will try. I have a background image in CSS, and then I have a table over the top of it, which has a white background. So you can't see the background in CSS. 

But the effect I want is to be able to hover over a circular image or shape which then reveals the background in that small area. 

A way to visualise this, I have a photo on the table, I put a piece of paper over the image so none of the image is in view. I now cut a hole in the paper so I can then see the photo through that hole. Plus as I move the paper around the image behind changes as I looking at a different part. 

This is used here http://www.thebestdesigns.com/2012/05/18/andy-chak/ with the letters going through to the background. 

Any ideas would be great, but I under stand if this is not possible. 