I want to create a hidden field in my main page and pass the value to an iframe. Also, i need to be able to pass the value back from the iframe to the pain page. however, I can't use the URL as these are PHP pages, I want to write something in the iframe page that will actually set the value of the hidden field in the page page, not just pass it via the URL. I'm sure this is possible as I've seen it done. can anybody help at all?