attachment_fu and public_filename

Hey all , I've been using attachment_fu for a while now and I love it, but recently I've been expanding and I have a setup on 2 servers, the first one is the application server and the second is the picture host. So I just setup my public/pictures directory as a NFS to my second server so uploaded pictures get saved to the second server. The trouble I have is the public_filename method reads from domain.com/ pictures/ and I need it to read from pics.domain.com/pictures/. I have all the DNS routing setup already but whenever I try to modify the public_filename method it always prefixes with domain.com/ and I just can't figure out how to override the whole domain it reads from. Any help you could provide me would be greatly appreciated. Thanks in advance.

Okay i fixed it, can't believe it took me this long to figure out. When i altered public_filename i only didn't prefix it with http:// i only did pics.domain.com. sticking the http:// in there works just like I need.