[RMVX ACE] [SCRIPTING] CHANGING SPRITE WITH GALV'S JUMP SCRIPT

Hi,

I'm using Galv's Jump Ability script and I want to make a small change to it, but I'm not sure how. Here is the script: http://galvs-scripts.com/galvs-jump-ability/
With the script as is, when the player jumps, the sprite stays standing. What I want to do is make it so that the player sprite changes when jumping. I don't know much about scripting, but I fiddled around with the script anyway but couldn't work out how to do it.