[Typo3-dev] make path relative to TYPO3_DOCUMENT_ROOT

[Thomas Murphy]

Hello everyone,

in the fileadmin, when I use a clickmenue extension, it gets an absolute 
pathname in $_GET, i need to change that into a relative 
(web-accessible) pathname.

like: /var/www/mysite.com/fileadmin/mytext.txt
to: /fileadmin/mytext.txt

I could search for 'fileadmin' in the string, but this is dirty, as the 
label for the fileadmin-folder can be changed by the install-tool.
Is there a function for this?

bye,
Thomas