Thanks a lot, Will try at once :-)
(part) of my question still remains though..... is'nt it possible to just upload alterantive images? As long as names, sizes and positions are unchanged, overwriting the originals should be enough? If so... what about names and sizes...
...or, are you saying that these images are all part of one file, and that i have to make a patch for this single file including my altered images?