To do this, I recommend that you have Netscape Navigator. Click and hold down on the graphic, until a menu comes up. Some World Wide Web browsers cannot display images. HTML provides a command to tell readers what they are missing on your pages. You should try to include alternate text for each image you use in your document, as it is a courtesy for your readers.
Some people like to put animation on their web pages.
It actually is not that hard. Here is some background history. You see most GIFs over the years have only one image per file. However, most programs that work with GIF are designed around the idea of one image per file. So the multi-image aspect of GIFs was forgotten.