It is very kind of people to offer advice but when I ask a question in a forum I'm really hoping for advice to my question - not to be told I shouldn't be doing it. I am aware of includes - in fact as the original page was an shtml one a PHP include would not have been a solution.

Thanks Alex for your idea about margins - I tried setting zero margins on the iframe but it didn't work. In the end I did give up and now the whole page is PHP

Justin