Thank you for your post.
On your layout, you may want to make every field a button. When you click on the button, it switches to an identical layout, but each field is accessible AND the "Done" button is available. When the "Done" button is clicked, have a script execute that commits the record and switches back to the other layout.
The conditional formatting will work on a field after the data is committed. In FileMaker Pro, this is immediate, whereas with Instant Web Publishing, you must wait until you commit/submit the record.
This should give you a good starting point.
Thanks!! It works great!