JQuery And Patial View In MVC?

What should i do when i want to submit the value fill from user and sent it to the ActionResult controller that return the partial view

-- View Code that call the controller (from article)

<script language="JavaScript" type="text/javascript">
$('#centerbody').load('/Custom/CustomAction', function(html) {
$('#centerbody')[0].value = html;
});
</script>

-- Controller Action with no parameter (from article)

public ActionResult CustomAction()
{
return View("_CustomParialView");
}