OK got your files from Yahoo. You are so close, here is what you need to do. Firstly double check the orientation of the helmet. When I bring it into Poser it is lying on the floor 6 ft in front of his feet. When I move from my modeling program (Truespace) to Poser I have to rotate X by 90 and Z by 180. Looks like you need to do similar. The next thing that needs attention is the grouping of the object file. Currently you have it as 16 groups, presumably different colour regions. You need to have it as a single group called "head". I would use UVMapper by Steve CoX for this.
Thats about it the rest looks fine. I'm watching this thread so if you get stuck just holla :)