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It looks o.k. to me, not sure what it was before (Maybe there is a lag with DNS). It appears that your mainfile.php still has www.justfriendsmedia.zenid.net/halcms/ ? That is what shows up in the links although www.halonline.nl/ remains in the address bar. If I pull up a link in a new window I get the justfriends URL.
If you want to show halonline.nl then you need to put that in the mainfile.php file. Then make sure you don't have any harcoded links in the theme, use <{$xoops_url}> which will follow your mainfile.php settings.
And, your local DNS needs to be correct. Is the server behind a firewall or something that would show different for you than other users?