Code:
NameVirtualHost *:80
<VirtualHost *:80>
DocumentRoot "/opt/lampp/htdocs/zeno"
ServerName zeno.biyg.org
<Directory "/opt/lampp/htdocs/zeno">
allow from all
Options +Indexes
</Directory>
</VirtualHost>
<VirtualHost *:80>
DocumentRoot "/opt/lampp/htdocs/fwarlords"
ServerName fwarlords.biyg.org
<Directory "/opt/lampp/htdocs/fwarlords">
allow from all
Options +Indexes
</Directory>
</VirtualHost>
That ought to do the trick.
Note: this is trickykid's example with one or two lines changed.
ETA: The first virtual server defined is the default.