<!DOCTYPE html>
<html>
<body>
<img id="myImg" src="compman_lowres.gif" width="107" height="98">
<br><br>
<button onclick="document.getElementById('myImg').src='compman.gif'">On</button>
<button onclick="document.getElementById('myImg').src='compman_lowres.gif'">Off</button>
</body>
</html>