Cannot change Apache2 ServerName/ServerAlias

["Yu,Glen [Ontario]" <Glen.Yu@ec.gc.ca>]

I'm having trouble changing the ServerName & ServerAlias to look up my page.

I'm running Debian 3.1 with 2.4.x kernel on an old Dell laptop, however, I can only access my page via http://server but not as something else (i.e. http://newpagename).  This is what I have at the moment inside /etc/apache2/sites-available/default (I simply changed DocumentRoot, commented out RedirectMatch ~/$ /apache2-default, and added in ServerName server and ServerAlias newpagename:

NameVirtualHost *
<VirtualHost *>
        ServerAdmin webmaster@localhost

        # DocumentRoot /var/www/
        DocumentRoot /home/glen/webdir
        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>
        <Directory /var/www/>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride None
                Order allow,deny
                allow from all
                # This directive allows us to have apache2's default start page
                # in /apache2-default/, but still have / go to the right place
                # RedirectMatch ^/$ /apache2-default/
        </Directory>

        ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
        <Directory "/usr/lib/cgi-bin">
                AllowOverride None
                Options ExecCGI -MultiViews +SymLinksIfOwnerMatch
                Order allow,deny
                Allow from all
        </Directory>

        ErrorLog /var/log/apache2/error.log
        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog /var/log/apache2/access.log combined
        ServerSignature On

    Alias /doc/ "/usr/share/doc/"
    <Directory "/usr/share/doc/">
        Options Indexes MultiViews FollowSymLinks
        AllowOverride None
        Order deny,allow
        Deny from all
        Allow from 127.0.0.0/255.0.0.0 ::1/128
    </Directory>

       ServerName http://server
       ServerAlias newpagename

</VirtualHost>


Regards,
-Glen