Is there a way to get this to work since DH has disabled fopen?
Yes, you would need to use cURL to retrieve the image file over HTTP and save it to disk, then call phpThumb on the local file.
Perl / MySQL / HTML CSS
How? I know I need to use something... but I don't know how to implement it correctly...
Did you uhhh, click the link in the post Atropos' post right above yours?
Also see php.net/curl