"If they leave out the fields it takes them to a results page that I cannot edit."
Well, if it's a cgi you uploaded....... then you could change the perl script "assuming it's perl" and possibly correct it there........ if it's not IN your cgi bin and is a virtual-server cgi (one you don't get access too) then I'm at a loss of what you can do short of contacting the server admin, and see if he can fix it........
There should be a graceful exit for bad entries.....