Set a background image for a document:
document.body.style.backgroundImage = "url('background1.png')";
<!DOCTYPE html> <html> <body> <h1>Hello World!</h1> <button type="button" onclick="myFunction()">Set background image</button> <script> function myFunction() {/* w ww . j a v a 2s .c o m*/ document.body.style.backgroundColor = "#f3f3f3"; document.body.style.backgroundImage = "url('background1.png')"; } </script> </body> </html>