PHP Form - http://yoce.com/f.html

I am trying to get this form to go to an error page if not filled in corectly which lists each error, ie. ‘please enter a valid email address’, ‘please select policy type’ etc etc…

here is the form i have: http://yoce.com/f.html

and here is the php file that was generated by the php program i was using: http://yoce.com/form2.php

please can someone help as i have no experience with editing php files and don’t know where to start

thanks

matt