I'm afraid I can't give you much information. The URL will just give you a blank page no matter whether you call index.php or any other file. The viewing of the directory tree is forbidden with an order, allow, deny order that I can't change so you can't see the directory tree (it's not my domain). There's nothing there to see.
I'm totally and completely lost trying to do this. I'm way over my head. I don't even know how to describe to you what's wrong. It just doesn't work.