is pointless. And it shows exactly your forum path. Which imho is not too safe. (Correct me if i am wrong).
Mouse over an image right click, properties and I know the file structure. Look in the nav bar and the forums root directory will be shown. Unless you have completly changed the directory structure of the install and can block users right click, view source, etc. I do not think there really is a point though I understand your concern and wish there was a real way to actualy block ppl from knowing.
As for my "fix" it works as I tested it on 2 sites. Maybe just did not explain myself properly
Regardless nice little mod