Link sites owners don't have time to keep records of what is a "good" hotlink and what is a bad one. The ocntent must be on the same domain so that (1) we know you are not hotlinking, and (2) that if the domain is up and the site active, we can assume within reason that the content is still up too. Nothing worse that a site that is up with the content going 404, that can lead to redirects and all sorts of stuff.
Your current setup is doomed to fail.
Alex
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