My form is showing fine in Safari and Chrome, but only shows the submit button in IE 8 (although I suspect that the problem is the same in IE 6 and 7). I must be doing something wrong, but can't figure it out.
Here is the URL: http://www.belmondo.nl/papaboekje.htm
what happens when you look at the form http://www.tfaforms.com/161871 in IE 8? When I looked at your code, I see it references that form. I looked at it and it renders fine.
The issue is from the localization file being loaded out of order on the http://www.belmondo.nl/papaboekje.htm. IE isn't smart enough to handle the situation. Remove the first reference to a localization file, line 24.