I've READ that your skills stay when you get cured. So I am assuming it doesn't matter if you are a vampire after that, when you go back to Werewolf the skill will be there.
You level in a skill line remains but the line will be hidden again.
Spent SP will be held there (hidden) unless you respec.
@Turelus - EU PC Megaserver "Don't count on others for help. In the end each of us is in this alone. The survivors are those who know how to look out for themselves."