[eluser]brianw1975[/eluser]
lol, Did you not just try it and see what would happen? I would be careful with doing that on a shared host....
As for a real answer it all depends on where the file is at on how you would get to it.... do whatever gets you there faster either ../../ or /var/www/mysite/otherdocs/a.html (not sure about winders)
As for the directory helper....
as it says: "Note: Paths are almost always relative to your main index.php file."
the example has './mydirectory/' and from the source it looks like you should be able to feed it a hard location i.e. '/etc/'