<html>
<body>
<script language="JavaScript"> function getID(elem) {
var id = elem.id;
alert("This element's id attribute is set to \"" + id + "\".");
}
</script>
<p>Click in the following image to display the id.</p>
<img id="myImg" src="yourimage.jpg" onclick="getID(this);">
</body>
</html>