S-curves in dinosaur necks?

[Rodlox R <rodlox@hotmail.com>]

out of curiosity, did all dinosaurs have an S-curve in their necks?...or 
were those restricted to the therapods?

ie, if an ankyosaur(sp) or ceratopsian ever evolved sans the frill and-or 
head armor, and had a longer neck, would it possess an S-curve (like a 
swan), or would it be stiff (like a giraffe), or something else?

thanks.













for those wondering, this line of thought comes from a crackling sound in my 
neck.