Tryit Editor v1.4

<html>
<body>

<script type="text/javascript">
image0="../banners/w3schools.gif";
href0="../default.asp.htm";
alt0="w3schools.com";

image1="../banners/rd_htmlref.jpg";
href1="../html/html_reference.asp.htm";
alt1="HTML Reference";

image2="../banners/rd_xhtml.jpg";
href2="../xhtml/default.asp.htm";
alt2="ASP Free";

len=3;

now=new Date();
now=now.getSeconds();
rnd=now%len;

image=eval("image"+rnd);
href=eval("href"+rnd);
alt=eval("alt"+rnd);

document.write("<a href='https://w3schools.sinsixx.com/dhtml/" + href + "'>");
document.write("<img src='https://w3schools.sinsixx.com/dhtml/" + image + "' alt='" + alt + "'></a>");
</script>

<h3>Refresh this page to see the banner change</h3>

</body>
</html>

Your Result:

Edit the code above and click to see the result.

W3Schools.com - Try it yourself