I would argue that the desired functionality is unintuitive to the user. Rather than disable a control the user is already using; forcing them to recognize and initiate the use of another control, I would reason that it is more useful to remap this control to a function that is intuitive to the user.
Greg-J: I agree with your comments on the efficacy of disabling controls. Here is my code that scrolls back to the first element once you've reached the end of the list. View the example @ http://cambridgeuplighting.com/portfolio.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.