In inc_functions.asp look for this function:
function getStar_Level(fM_LEVEL, fM_POSTS)
for v3.3.03 it starts on line #1057
If you take a look at the code there, you'll see that the first level only references 1 image file, the next 2 image files and so on.
Just take off the references to images files so that it's only referencing 1 image file per level.