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use strict; document.addEventListener ( DOMContentLoaded , ( ) = > { const images = document.querySelectorAll ( #image _ rollovers img ) ;
"use strict";
document.addEventListenerDOMContentLoaded
const images document.querySelectorAll#imagerollovers img";
process each img tag
for let image of images
const oldURL image.src;
const newURL image.id;
preload rollover image
set up event handlers for hovering an image
image.addEventListenermouseover
image.src newURL;
;
image.addEventListenermouseout
image.src oldURL;
;
;
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