[Typo3] sp_directory. Minor bug?

[mario]

hi,
a note on the ext. Address Directory (sp_directory)

It seems to me that the definitions of wrap1 (2,3) within
ext_typoscript_constants.txt do not work:

# cat=plugin.tx_spdirectory_pi1/typo; type=wrap; label= Wrap 1: This
wrap is used in the template-file.
wrap1 = <table border=0><tr><td><img
src=/t3lib/gfx/i/modulefolder.gif><strong> | </strong></td></tr></table>

and modulefolder.gif is not retrieved.
 
It works for me, if I insert the location of my testsite folder, i.e.:

# cat=plugin.tx_spdirectory_pi1/typo; ... ................
wrap1 = ...<img src=TESTSITEFOLDER/t3lib/gfx/i/modulefolder.gif><strong>
| ...

Clearly, this is not a general fix. 

If somebody has already fixed this in the proper way, pls let me know.
Thanks a lot
mario