how to execute Form action from Jquery

how to execute Form action from Jquery

I have a form with j query validation , and the jquery code contain ajax function to execute the php file which insert the data into database .

But i face a problem when some of form fields are file type , which upload an image , but i can't upload image with jquery and ajax as you know


so now , how can i execute the form validation while i put
<form action="add.php" method="post>
</form>

can i perform the page add.php after all jquery validate functions ?

without ajax.