Changing the display order

thanks for reply, but it dosen't work.

as you can see the screenshot: imgur.com/MW7djOc

the images filename: 001.jpg, 002.jpg, 003.jpg

after I edit the code to:$item_count = 0; rsort($lists);

the images order should be : 3 , 2, 1

but it still shows:1, 2, 3

help plz.