ARGH !

I had a form on our website for customers to contact us. I had tested it and it was working fine. Now i have found that it has stopped working. It keeps giving an error that the email and subject lines arn't filled in, even tho' they are ! nothin has changed so why has it stopped working ? what needs changing?

the three pages/files are at:

www.exevalleyfurnishing.co.uk/feedback.php

www.exevalleyfurnishing.co.uk/feedback1.php

www.exevalleyfurnishing.co.uk/feedbacksent.php

any and all help with this is thankfully recieved as i am not conversant with php !

Cheers, Ian