Aspx page calling php from form

Revision 1
Hi Friends,
I have one aspx page and html page..Here I am copying one form from my html page as below...Since this form is calling php...The validations are not getting applied in my aspx page While the validation on submit is wrkng fine in html..Dont know how to proceed please help..
<form action="LegalBay.php" method="post" name="LegalBayform" onSubmit="return LegalBay();">