One more question - if we use this code, how do we get the form to provide an error message to the user? "Please provide a business email address."
Sanford Whiteman - I'm trying to get this code to work on a Marketo LP first - and it's having no effect. Is there other code that needs to go around the sample you provided that a developer (which, as you know, I'm not) would automatically be adding? I did put it the whole thing inside <script> </script> tags.
While I agree with your assessment in potentially missing good prospects, this solution matches some business requirements and while not absolute, certainly hits across a large segment.