Why is it you need your domain name to be prefixed by 'www.'? It does exactly the same thing either way.
However you can include some JavaScript on each page (sorry, I don't know the Apache code):
Code:
if(window.location.substr(0,11)=='http://www.')location.replace('http://www.'+location.substr(12));
-Snib -
http://www.snibworks.com
Where will you be in 100 years?