Might try to drop this in where your image is located. Works for me. Should update every 3 minutes or change the "T" to your needs. Other images can be added, like image2, image3 with additional "id"s.
Good luck, Doug
<center>
<img src="https://www.m82a1.us/weather/BackCam.jpg" width="620" alt="webcam" id="refresh"></img>
</center>
<script language="JavaScript" type="text/javascript">
//<![CDATA[
var t = 180 // Interval in Seconds
image1 ="/weather/BackCam.jpg" //URLs of the Images
function Start() {
tmp = new Date();
tmp = "?"+tmp.getTime()
document.images["refresh" ].src = image1+tmp
setTimeout("Start()", t*1000)
}
Start();
//]]>
</script>