Please solve my problem

Dear Sir/Mam,
Please see solve my below problem in html page, i m check my page on w3c validator, all error r removed but only one left error so please you can help me remove this error:

Error Name there is no attribute "NAME". 
                <form name="contactForm" method="post" action="contact.php" onsubmi

& please reply me ASAP.

Thanks
Nitin Gupta
User Interface Developer
9910688211
Dimension India Networks (P) Ltd.
Sec-.2, Noida UP.(India)