Form Action String not firing when click on the submit button

Hi Every One, I used the simple catch theme for designing my website, simple catch theme is good for me, but i what to add employee login, for that i created the page temple with two text boxes and submit button. And file i created are employee.php and validate.php and those are placed in Simple catch theme folder, When i try to call the validate.php with form action string i got the error page not found <form name="login" method="post" action="validate.php"/>   , can any one please help me call the php file(placed in the theme folder) in the form action string.