I'm trying to rename my apache2 localhost folder.

I have already gone to /etc/apache2/sites-enabled/site-name
and changed the following lines in the Document:

DocumentRoot /home/user/public_html

Directory /home/user/public_html

'public_html' is then the new name of my localhost.

Then i restarted the apache2 server, but this does not work as when i type 'localhost' in my browser i just get an empty screen.

What else must I do to change the folder name of my localhost?

My system is an L-Ubuntu 11.04, by the way.