JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://www.bbc.co.uk/blogs/mt-static/support/assets_c/userpics/userpic-3751-100x100.png" id="image1">
<img src="http://www.cap.org.uk/~/media/Images/CAP/Section/CAP%20code/broadcast.ashx" id="image2">

CSS

img {
    position:absolute;
    top:0;
    left:0;
}
#image2 {
    display:none;
}

JavaScript

jQuery(document).ready(function($){
    setInterval(function(){            
        $('#image1').fadeToggle('slow');
        $('#image2').fadeToggle('slow');
    }, 2000);
});