The second paragraph in step 2 uses a thumbnail image to lauch the larger picture and this seems to be the one that you want so you can discard the first text-link paragraph. However, if you haven't spotted it, there is an error in this part of the script. The 'href' part has an extra double quote after the image name "...../countryxb6.gif"" but there should only be one double quote there. I don't know if this would be enough to stop it working but you should put it right. You also need to change the path and filename to point to your own larger picture.
The thumbnail image in the example code is simply called "thumbnail.gif" so this should be changed to the name of your thumbnail if it is different.