Well, you're ready.
To get this search for your web site simply:
1) Right click this image
and save it on your machine. It's only 476 byte.
2) Select the html part in the box below and save it as text.
3) The form assume that image is in /img directory in your site root. Modify the HTML code if you wish to use another location.
4) Copy the html (only 945 byte) inside your page source and upload the modified page and the image in the same directory on your site.
5) If you like, sign the guestbook. So I can tell You if something change. That's all. Have a good search.