Mark's coding playground...

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