permission in apache

[GNorm]

I have installed apache and got it to run, however when I tried to 
access a web address that I have set for virtual hosting I get the 
following message:

Forbidden
You don't have permission to access / on this server.

I assume this error is the results of the permission on the directory 
containing web content. I have looked at the permissions for the default 
web directory and tried those settings, the default site works, the 
virtual sites do not.
As always, any help will be appreciated.

Thanks Lowell, for your help I was able to get the invalid error cleared 
up.

Gregory Norman