I think Volkan is not running his own server but using a host.
Its not going to work with url forwarding or frames.
If you want to host multiple sites by domain names you need a fixed ip address and then point both domains to this same ip address. Then you can force a redirect with a preferred host name as Joe Davis has said.
The error about permission denied sounds like a file permission issue where there is not read permission on that script file or else it is missing.
Hope it helps,