I've added
link rel="apple-touch-icon" href="apple-touch-icon.png"
to the main index.php file in the head section. I've got apple-touch-icon.png
in the root dir. I've tried 57x57, 72x72 and 114x114 pngs.
When I click the 'Add to Home Screen' button in Safari, the iPad fails to find my .png file. It shows a black box with a grey outline. I can't figure out how to get my iPad to use my .png image.