JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://www.itnetwork.cz/images/logo_cz.png?v=2" id="img1"/>
<img src="http://www.itnetwork.cz/images/img/person.png" id="img2" />

JavaScript

var img1 = document.getElementById("img1")
var img2 = document.getElementById("img2")

img1.onclick = function () {
    if (img2.style.display == "block") {
        img2.style.display = "none"
    } else {
        img2.style.display = "block"
    }
}
img2.style.display = "none"