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<!DOCTYPE html> <html> <body> <img src="pic_bulboff.gif" width="100" height="180"> <p>Click the button to change the src attribute's value of the image above.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementsByTagName("IMG")[0]; x.getAttributeNode("src").value = "pic_bulbon.gif"; } </script> </body> </html>