Thanks for the link under_exposed. I hadn't thought about validating my pages against a particular DTD schema before. I was just working on the basis that the pages should be valid XML, aiming towards XHTML, and that the displayed results in both IE and Firefox are what I wanted. Out of interest I validated a few of my favorite sites, and even the mighty pprune and cricinfo sites failed, so I don't feel too bad
Regards
Stoney