Hi everyone! I have a question about a javascript code which I am afraid might be a little advanced. I am creating a 2AFC experiment with visual stimuli (as displayed in the image below). I am presenting these images to the participants in a randomised order. I want to re-present them to the participants with ELO-rating (like in chess:.(click here for explanation on ELO rating system))  to get a good distribution of the stimuli comparisons. I found the following javascript code on GitHub for ELO-rating (click here for the GitHub), but I do not know how to modify this for Qualtrics, since I am a programming novice.

Any assistance would be greatly appreciated!