What type of spider is this?

Here are two pictures of it : http://www.flickr.com/photos/66188877@N03/6193835906/in/photostream/ http://www.flickr.com/photos/66188877@N03/6193325699/in/photostream/ Sorry that I couldn't get a better picture of it's back..It was very alert, and when I got close, it would flee.. I also have... แสดงเพิ่มเติม Here are two pictures of it :
http://www.flickr.com/photos/66188877@N03/6193835906/in/photostream/
http://www.flickr.com/photos/66188877@N03/6193325699/in/photostream/

Sorry that I couldn't get a better picture of it's back..It was very alert, and when I got close, it would flee..

I also have another spider to identify :
http://www.flickr.com/photos/66188877@N03/6131854076/in/photostream/

I know they are both orb weavers, I just would like to know the species,or atleast the genus
อัพเดต: For some reason, #2 resembles Neoscona oaxacensis..Plus, Neoscona crucifera is not in my area..I live in Detroit.
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