Untitled

<!DOCTYPE html>
<html>
<body>

<h2>Light ON or OFF by Abhijit</h2>

<p>Light Bulb ON or OFF using JavaScript</p>

<button onclick="f1()">Turn on the light</button>

<img id="img" src="2.png" style="width:300px">

<button onclick="f2()">Turn off the light</button>

<script>
function f1()
{
var obj=document.getElementById('img');
obj.src='1.png';
}
function f2()
{
var obj1=document.getElementById('img');
obj1.src='2.png';
}
</script>

</body>
</html>