What happens when you put the full path to your file in the include()?
If you're in this level:
/home/directory
and your file is in:
/home/directory/sub/file.php
you could do:
include("/home/directory/sub/file.php");
No? Is that what you're looking for? If not, give me another example of what you mean when you say it is only a level down. To me, that means a subdirectory of the current working directory.