error page after upload files

Hello.

I install gallery2 in a local host with xampp, in local network works good but the problems comes when i try to upload a file from internet.
I upload the pic, the upload process is correct but when refresh the page in gallery the direction is localhost and not the dyndns domain.
When you retype dyndns direction the pic is upload and you ca see a edit the pic and properties.
How i can make a configuration that when refresh the page goes to dyndns direction.

Sorry for my english.

Thanks