JSFiddle - React, Tailwind, and code Playground

HTML

<body onload='chooseDiv();'>
<div>
    <form role="form">
        <div>
            <div class="radio" id="radioSelection" onchange="chooseDiv()">
                <label>
                    <input type="radio" name="optradio" id="selectionDiv1" checked />Choose Div1
                </label>
                <label>
                    <input type="radio" name="optradio" id="selectionDiv2" />Choose Div2
                </label>
            </div>
        </div>
    </form>
</div>

<div id="parentDiv">
    <div id="div1"></div>
</div>

<div style='display:none'>
    <div id='c1'><span>TEST 1</span><img src='http://cdn.sstatic.net/stackoverflow/img/apple-touch-icon@2.png?v=hiFacebook'/></div>
     <div id='c2'><span>TEST 2</span><img src='http://zelcs.com/wp-content/uploads/2013/02/stackoverflow-logo-dumpster.jpg' /></div>
</div>

</body>

JavaScript

function chooseDiv() {
    var div = document.getElementById("div1");
    var msg =  document.getElementById("c1").innerHTML;
    
    if (!document.getElementById("selectionDiv1").checked) {
        msg = document.getElementById("c2").innerHTML;
    }
    
    div.innerHTML = msg;
}