I've followed the instructions in /etc/httpd/conf.d/welcome.conf and change the two bits I usually edit http.conf:
DocumentRoot "/mnt/SharedFiles/www"
<Directory "/mnt/SharedFiles/www">
It ain't worked though - what have I forgotten, yes I restarted the service.
What are the symptoms of the problem you are having, and do you have SELinux enabled?
Are you getting 403 (forbidden) errors, or are you getting documents from /var/www?
Paul.