I recently tried this groovy idea called an animated favicon - it currently only works in FireFox but they say other browsers will follow suit eventually
Step One: First off to create your animated gif follow
these instructions.
Step Two: To create your standard favicon follow
these instructions.
Step Three: Then follow these instructions:
Firefox allows webmasters to use animated favicons and it is likely more browsers will eventually follow suit. While Internet Explorer does not support animated icons in any way, there is an easy way to code things so that you can display an animated favicon in supported browsers and a standard icon for all others.
Normally, one could just plop the favicon.ico image in a website’s root directory and it would show up without even the need to add a link to it. To get both icons showing in all browsers, we’ll need to add not just the link to the normal favicon, but also to the animated one.
Create your animated icon 16 pixels high and wide. I recommend calling it favicon.gif and uploading it to your website’s root directory, which should be where your regular favicon.ico file is. Put the code beneath this paragraph anywhere between the <head> tags of your website, making sure the paths are accurate, and you’re good to go. Firefox will show the animated .gif as the favicon, even when the user bookmarks the page, and Internet Explorer and other browsers that do not support it will continue to use the boring non-animated version. Note, if you have a cached bookmark image, it will show it until you clear your cache.
<link rel="shortcut icon" href="favicon.ico">
<link rel="shortcut icon" href="favico.gif">
- <link rel="shortcut icon" href="favicon.ico">
- <link rel="shortcut icon" href="favico.gif">
Original tutorial found here
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