i found his code on google as a step by step guide thats explain what every row doing and where you need to change the code to Descending.
I can do it to but i need to run some tests to check if its work and i`m kinda lazzy :P
you can make a new array and get all the asc array to there one by one in a loop or you can loop the array backwards... or you can find and read the script writer guide.