403 forbidden on Apache vHost
This is very much off topic as it is unrelated to Apple hardware/software.  However, I wanted to point you in the right direction.

The problem that you are running into is that 


In your httpd.conf, the directory permissions are not set properly
Your .htaccess file is not configured properly
The system doesen't have the correct permissions for the directory


The best thing to do is consult the Apache documentation about the VirtualHost directive.  

The Server Fault and/or Super User boards here on Stackexchange would also be beneficial to solving this particular problem.