Shoutbox

I am also confused by the original scripts, it is from Display Picture Changer, the newest version, I would like to display the picture's filename, too, so my friends knows what that picture is. Then I tried to modify the code and found that line. I tried use that line:
Messenger.MyPersonalMessage=fileName;

Although fileName is not a pure string object, it seems it works fine. But cannot get substring from it.