Spider identification?

This spider has been on my back porch for about a week. I have been leaving the back porch light on and he has been eating well. He comes out about 9pm and does a few repairs on his web then waits. He has very distict marking on the bottom of his abdomen. White and yellow markings on a black square. I have been... show more This spider has been on my back porch for about a week. I have been leaving the back porch light on and he has been eating well. He comes out about 9pm and does a few repairs on his web then waits. He has very distict marking on the bottom of his abdomen. White and yellow markings on a black square. I have been catching moths and throwing them into its web. Very fun to watch.
Update: http://i436.photobucket.com/albums/qq89/dmckil/IMG_3768.jpg
<a href="http://s436.photobucket.com/albums... target="_blank"><img src="http://i436.photobucket.com/albums/... border="0" alt="Spider 2"></a>
Update 2: http://i436.photobucket.com/albums/qq89/dmckil/IMG_3757.jpg
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