Small, cool looking backyard spider from Arizona

[MantisDude15]

http://media.rfc1437.de/cms-media/2005-11-13/CRW_1121.jpg

the spider looks like that, but browm and yellow on the back, and the yellow is triangles running down the back. anyone know what it is? anyone wanna buy it? $5 lol

 

[ABbuggin]

It is a type of an orb spider...don't know the exact species though