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Micrathena sp.
Family Araneidae
Great color, looks like the german or belgian flag. Probabgly genus Micrathena or Gasteracantha
Remembers me of Micrathena raimondi, but I am not 100% sure. Your perspective is tricky to compare with the Raimondi I found:
http://www.flickr.com/photos/artour_a/45...
Its spines and spinnerets make me think it's some kind of Micrathena, but I am not familiar with spiders in your region so I can't say for sure. They're generally known as Spined Orbweavers, which matches the comment above. Whatever it is, it's beautiful!