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Araniella Displicata
Looking at the web it could be a nursery web spider. Beats me. Very pretty with the yellow body. Image three it was hiding on me.
Never would have guessed it was an orb weaver from the looks of the web. Interesting.
http://bugguide.net/node/view/39832
Here is a link to go with the ID suggestion. I agree that this is the most likely species. They are pretty little spiders!