Try cleaning this up a bit.
for (var i=1; i<7; i++) {
let clone = org.cloneNode(true);
clone.setAttribute( 'id', "Sprite" + i );
clone.style.top = "0px";
clone.style.width = "500px";
sprites[i] = clone;
org.parentNode.appendChild(clone);
}
Also images have width and height "attributes" not just the css styling of them:
clone.width = 500;
clone.height = 300;
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