Make sure it's on your server - and make sure your path is correct - I insert mine with this code
<link rel="shortcut icon" href="favicon.ico">
in the head section - the line you show looks for your favicon in a folder called 'path_to_image' - I imagine this is NOT where you put it.
In internet explorer, Firefox and in your favorites bar, a small Icon is displayed. I would like to know how you create and code these icons into the website. I all ready have a .ico converter to convert files to this format, am using 16 by 16 pixels. I named the file favicon.ico and have the following text inserted in between the <Head> commands: < link REL="shortcut icon" type="image/x-icon" HREF="/path_to_image/favicon.ico" >