Bulb_magic.html

<html>
<head>
<style>
#dv {
  height: 50px;
  width: 50px;
  border-radius: 50%;
  border: 5px solid black;
  color: black;
  text-align: center;
  line-height: 50px;
  font-size: 30px;
  font-family: impact;
}
</style>
<script>
function demo() {
  var dv1 = document.getElementById("dv");
  var im = document.getElementById("img1");

  if (dv1.innerText === "ON") {
    dv1.innerText = "OFF";
    dv1.style.border = "5px solid green";
    dv1.style.color = "green";
    im.src = "img/on.png";
  } else {
    dv1.innerText = "ON";
    dv1.style.border = "5px solid red";
    dv1.style.color = "red";
    im.src = "img/off.png";
  }
}
</script>
</head>
<body>
<center>
  <img src="img/off.png" id="img1"/>
  <br/><br/>
  <div id="dv" onclick="demo()">ON</div>
</center>
</body>
</html>