probelem exporting

k i tryed to export a model to sculptris and all these sections were missing in tri’s, so i was like ow i must just have to hit the convert to tri’s button when i export and still the same thing, like this is what it looks like on blender, also there are some … wierd dark spots, any way to fix that too

http://i36.tinypic.com/24xq64k.jpg

and this is what it looks like in sculptris