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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> </html>