User-821857111 posted
I don't think there is. As far as I recall, the designer in 2003 was effectively based on the IE (Trident) rendering engine. At some stage, (2008, I think) a new rendering engine was introduced that wasn't based on IE, or any browser, in fact. It sounds
like your pages are developed using some quirkiness in IE 5/6 which browsers can cope with, but the designer can't.