SO - 29909512

by Arun P Johny

HTML

<img id="image1" src="//placehold.it/32/ff0000" />
<img id="image2" src="//placehold.it/32/0000ff" />
<button id="btn1" />

JavaScript

function swapImages() {
    var image1 = document.getElementById("image1")
    var image2 = document.getElementById("image2")
    var src = image1.src;
    image1.src = image2.src;
    image2.src = src;
}

function init() {
    var button1 = document.getElementById("btn1")
    button1.onclick = swapImages;
}

window.onload = init;