Untitled

<html>

<head>

<body style="background-color:black;">

<img src="https://www.kitco.com/images/live/gold.gif?rand=' + Math.random();" id="Gold" />

<br>

<img src="https://www.kitco.com/images/live/silver.gif?rand=' + Math.random();" id="Silver" />
<script>
setInterval(function() {
    var myImageElement = document.getElementById('Gold');
    myImageElement.src = 'https://www.kitco.com/images/live/gold.gif?rand=' + Math.random();
}, 30000);

setInterval(function() {
    var myImageElement = document.getElementById('Silver');
    myImageElement.src = 'https://www.kitco.com/images/live/silver.gif?rand=' + Math.random();
}, 30000);
</script>
</body>


</html>