I think you mean the root of the server right?
Meaning, if in the server your docs are in /www/username, you want to get a file from /www.
There is no way you can go above a document root in apache unless you use symbolic links or use PHP to load the document (acting like a proxy).
But if you meant "local dir" as in the local directory on the client's computer, then follow what devin and Richard have suggested :-)
-sridhar