Form Validation using Javascript

Please could someone have a look at [[login to view URL]][1] and look to add form validation Fields - Firstname Surname Address Postcode Phone Number Email There is an issue with the postcode in that the system that accepts the quotes at the merchant has to have the postcode in two parts. For example RH150RR would need to be enter by the customer as RH15 0RR BN53FG would need t be entered by the customer as BN5 3FG I am not sure how to do this on a form so if anyone knows how, then great. If not, the form validation would need to handle it Otherwise, it should be a simple job for a coder Many Thanks Rob