As with the previous demo Internet Explorer and Opera have a smooth transition between images whereas FF flashes from one background image to the next.
A lot of his stuff isn't 100% smooth or cross browser happy - I'm just consistently amazed by the range of ideas he has and the time he spends developing them.
Welcome aboard. Very nice but the difference between yours and his, and the reason we're impressed is that his complies fully with w3c standards and is accessible.
He doesn't need any plug-ins for it to display in all browsers either.