| 10:38 pm on Oct 21, 2007 (gmt 0)|
You need favicon.ico file in your root directory. Most browsers will look for it there. You could also specifiy between the head tags in your page :
<link rel="shortcut icon" href="/favicon.ico">
It's a specific format, however there are a lot of online tools for converting common image types to .ico if you don't have image software that supports it.
| 7:52 am on Oct 22, 2007 (gmt 0)|
Even easier than converting via 3rd party software; using windows (not sure about macs) you can simply rename GIF's with the .ico extension.
The Coalman has covered the rest. One thing to add - if you use absolute ref your favicon will show up more consistently in IE.
| 10:01 am on Oct 22, 2007 (gmt 0)|
Changing the extension might work but just like changing the extension on a animated .gif to .jpg it's not really a animated .jpg
That really works BTW. At the very least I know IE6 will display it ;)
| 7:32 pm on Oct 22, 2007 (gmt 0)|
A proper .ico file is actually a two-layer file consisting of a 32x32 pixel indexed color image and a 16x16 pixel indexed color image. They can be transparent or not. Depending on where it's deployed, the appropriate one will display (32 for desktop, 16 for in-folder, 16 for address bar, 32 for bookmarks, I think.)
png2ico is a command line app for this, it's free and easy. You create the two images, save them as .png, then run the program via command line/DOS: png2ico favicon.ico file1.png file32.png [press enter]. It's a snap, make sure to make a donation when you download it, this is one of the gold nuggets of the Internet. :-)
| 7:56 pm on Oct 22, 2007 (gmt 0)|
irfanview will save in .ico format
| 5:40 pm on Oct 23, 2007 (gmt 0)|
Another option, from MS ...