I got a question in a tutorial [Adding Thumbnails] !?

My Question is: In [Adding Thumbnails] Page 3, step ix (9)
{here is the link: http://www.kirupa.com/developer/mx2004/thumbnails3.htm}

After i press Ctrl + Enter, I can’t see any thumbnails loading in the same spot, or even didn’t load it, but i still can get those picture at the top (not the thumbnails ). I really don’t know why, can someone tell me why and how to fix it, please ? thank you…:snug: