hi,
what i did is i just make $PHPTHUMB_CONFIG['nooffsitelink_enabled'] = true;
$PHPTHUMB_CONFIG['nooffsitelink_enabled'] = true;
then add the domain names in $PHPTHUMB_CONFIG['nooffsitelink_valid_domains'], separated by comma.
like this:
$PHPTHUMB_CONFIG['nooffsitelink_valid_domains']= array(@$_SERVER['HTTP_HOST'],'www.mysite.com','http://www.mysite.com', 'mysite.com');
everthing works fine now... i hope this help.
=)