I don't think there is a way to add favicons by CSS. You could try to use a server side script (like PHP, ASP or Server side include (SSI)) if the server support it. Internet Explorer automaticly looks for a favicon.ico in the server root if you bookmark the site, but IE is the only browser that do that. If you can't use any server side scripts you will have to insert it to every html page. You can open all files in Dreamweaver and use the find and replace function like in the picture, just hit replace all, It will add a "<link rel="shortcut icon" href="/favicon.ico" />" before every "</head>".