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<!DOCTYPE html>
<html>
<body>
​
<img id="myImage" onclick="changeImage()" src="pic_bulboff.gif" width="100" height="180">
​
<p>Click the light bulb to turn on/off the light.</p>
​
<script>
function changeImage() {
  var image = document.getElementById('myImage');
  if (image.src.match("bulbon")) {
    image.src = "pic_bulboff.gif";
  } else {
    image.src = "pic_bulbon.gif";
  }
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_lightbulb by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 13:24:10 GMT -->
</html>
​
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