file include relative file addressing.

From the root of a website: / I had a file called /my.php which included a file /include/blah/my.inc.php In my.php if I put the include_once( "./include/blah/my.inc.php" ); it works fine when my.php is in the root of the site. If I move /my.php to /blah/my.php, no matter how I address ../include/blah/my.php or /include/blah/my.php I keep getting path errors. How do I get around this problem using only relative paths (no absolute or placing in an include path) Neil.