Your getting a server error because hardcore
only gave you part of the code. It should
not end with a carriage return.
http://www.lancs.ac.uk/people/cpaap/pfe/
This is the URL of a free program editor.
(download and install it then open the file)
When you highlight your code in the htaccess
youll see something that looks like a "top
hat" on it's side. Thats a carriage return.
Use your backspace and remove the very last carriage return.