No AJAX is necessary, just update the image's src property. But, since it has the same url, you have to give the browser a unique address to ensure you don't just load the old image from the browser's cache. You can guarantee a unique image by getting the current date's serial number via new Date().valueOf() and appending that to the url as a querystring.
$("#dynamicImage").prop("src", "dynamicImage.jpg?" + new Date().valueOf());
You can also use new Date().getTime() to get the serial number, or just coerce the date to a number: +new Date()
To do it on a timer use setInterval(). This would be the complete code that you could just drop inside a script tag in your page's <head>:
$(function() {
var intervalMS = 5000; // 5 seconds
setInterval(function() {
$("#dynamicImage").prop("src", "dynamicImage.jpg?" + +new Date());
}, intervalMS);
});
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