Subsurf help

hey, i’m having trouble with subsurf, i’m making a car model, and every time i trry to smooth the piece it makes a couple weird black lines, and i can’t figure out why!
does anybody know what to do?
here is a a screenshot.http://photos-c.ak.facebook.com/photos-ak-sf2p/v164/114/57/731531530/n731531530_535826_1650.jpg

Looks like a normals problem to this black duck.

Have you tried entering edit mode, selecting all verts then hitting Ctrl-N, to “Recalculate Normals Outside”? (Ctrl-Shift-N makes 'em point inwards)

Dude! thanks so much!! it’s like magic!
i didn’t think it was so simple!!

Pleasure.
Well, like I always say - Making an atom bomb is easy…once you know how.

Merry Christmas.