First, why do you have `mysite.com/something` when `mysite.com` means nothing? Why don't you just use the root of your domain then? (Zenphoto can be installed in the root of course).
Second, Zenphoto provides several functions to get these links (`$mysiteurl/pages/page` is a Zenpage page named "page" and `$mysiteurl/something` is an album named `something`).
There are also some constants WEBPATH and SERVERPATH, or FULLSERVERPATH available:http://www.zenphoto.org/documentation/functions/_functions-basic.php.html