Okay, this is probably a simple fix, but I'm clueless.  I can open moodle by pointing my browser to "localhost/moodle", but if I put in "www.walterswebdesign.org/moodle", I get the following message:

Forbidden

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

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Apache/2.0.55 (Ubuntu) PHP/5.1.2 Server at www.walterswebdesign.org Port 80

Why don't I have permission??  It worked fine on my Windows (WAMP) server.  What setting do I have to change on my Linux (LAMP) server to see this thing?