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Welcome to xoops!
I would think that if your server is setup correctly and you don't have 'nohotlinking' enabled, then you are probably using the wrong paths in your mainfile.php
Your Virtual Path should be your domain name 'http://www.mysite.com'
and the Physical Path should be for Linux something like:
'/home/username/public_html/myxoopssite'
and for windows:
'c:\www\myxoopssite
If not, post a link to the site, so we can have a look