Well, i'm unclear what this thread is about since as far as i can tell Edwulf never included an image in his query.
Here is an interesting page on Viking helmets though which i believe shows the one accepted authentic Viking helmet found to date.
http://www.hurstwic.org/history/arti...ng_helmets.htm
I believe it is true that Viking helmets did NOT have horns, but these small figures from the 6th-9th century Sweden and Denmark perhaps show where some might have gotten the idea that they did. I think these are more ceremonial (religious) than martial in their intent.