change image in gallery on mouse movement

Hi everyone, I am looking into injecting a custom script into the homepage of my website (jamie-smith.com/home-1). Specifically, I am trying to have the header image on the home page cycle through the images in the gallery asset library for every, say 10 pixels the users mouse moves over that section. I tried to implement this basic script cycling between just two images (the original and one other) to see what would happen, but to no avail. Does anyone have an idea on how to implement this?