JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.github.com/iamnoah/element.write/master/element.write.js"></script>
<script src="https://raw.github.com/iamnoah/writeCapture/writeCapture2/writeCapture2.js"></script>
<div id="top_ad"></div>
<input value="Test" type="button" onclick="loadAd();">

JavaScript

function loadAd() {
    var rnum = Math.round(Math.random() * 100000);
    if (window.self != window.top) {
        var nf = ''
    } else {
        var nf = 'NF/'
    };
    writeCapture(document.getElementById('top_ad')).write('<scr' + 'ipt type="text/javascript" src="http://www.burstnet.com/cgi-bin/ads/ad7397a.cgi/v=2.3S/sz=468x60A|728x90A/' + rnum + '/' + nf + 'RETURN-CODE/JS/"></scr' + 'ipt>').close();
}