A Favicon is a small image displayed in the navigation bar of the browser, and also in the list of bookmarks:
The Favicon is not something we can actually control with the theme, but it is the finishing touch for the site, and it does lead us into another interesting area of PHP-Nuke customization. Favicons behave rather strangely in Internet Explorer, and you will find that you need to add a site to your Favorites before the Favicon is displayed.
First of all, the Favicon is an image in a special format, ICO format. The file consists of a couple of copies of the same image at different sizes (16x16 and 32x32 usually). We will need to convert any standard graphical image we plan to use to this format before we continue.
You can download a free command-line tool to convert from PNG files to ICO files here:
http://www.winterdrache.de/freeware/png2ico/
There is an executable version of the application for Windows there, and instructions on how to use it. For other platforms you...