Registration link alteration possible?

[skidpics]

I run a website at photospider.net, with yahoo webhosting coming from skidpics.com

I have the domain masked, so no one sees the redirect.

When users register, I get this:

In order to activate your account with username "test", you need to click on the link below or copy and paste it in your web browser.

http://skidpics.com/coppermine/register.php?activate=e9f8108f4b78acc0e9b4151c06bbe510

How can I make it read:
http://photospider.net/register.php?activate=e9f8108f4b78acc0e9b4151c06bbe510

[Halfhidden]

The url is showing the directories and files in hierarchy order and as expected. The reason you haven't received a reply is because this isn't a Coppermine question, however you should be aware that the process you seek is known as directory cloaking and although commonly used once, I'd personally not recommend it. But if you must then search for domain cloaking within the internet.