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Calling a script from an external file

We Can just recall the previous example of image switching to understand how to call script externally.
 Let's have a look. 
 
<html>
<head>

</head>
<body>

click on the image


</body>
</html>
Using the tag 
  <script type="text/javascript" src="functions.js"> </script>
we can call the script externally. Always write script in file with extension ".js".
functions.js: 
 
function imageswitch(){
var image = document.getElementById('switchimage');
if(image.src.match("one"))
{
image.src = "flower_two.jpg";
}
else
{
image.src = "flower_one.jpg";
}
}
Note: Make sure that the both html and js file locations are the same or else defime them specifically
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