<html>
<body>
<script>
function light(sw) {
var pic;
if (sw == 0) {
pic = "images/pic_bulboff.gif"
} else {
pic = "images/pic_bulbon.gif"
}
document.getElementById('myImage').src = pic;
}
</script>
<img id="myImage" src="images/pic_bulboff.gif" width="100" height="180">
<p>
<button type="button" onclick="light(1)">Light On</button>
<button type="button" onclick="light(0)">Light Off</button>
</p>
</body>
</html>
