Thanks, that did the trick.
Your validation/error script seems to override the built-in Spry script...so that even if they don't fill one of my new fields in, as long as your 4 are filled in correctly, the email sends anyway. I tried copying the validation code from one of yours (such as Contact_Name field) so that they would get an error message if they did not fill in one of my new fields. I just got lots of ugly code on the page. I assume this won't work unless I have your FormBuilder?