Prevent redirect after form is submitted

You should post it with ajax, this will stop it from changing the page, and you will still get the information back.

$(function() {
    $('form').submit(function() {
        $.ajax({
            type: 'POST',
            url: 'submit.php',
            data: { username: $(this).name.value, 
                    password: $(this).password.value }
        });
        return false;
    }); 
})

See Post documentation for JQuery

Instead of return false, you could try event.preventDefault(); like this:

$(function() {
$('#registerform').submit(function(event) {
    event.preventDefault();
    $(this).submit();
    }); 
});

$('#registerform').submit(function(e) {
   e.preventDefault();
   $.ajax({
        type: 'POST',
        url: 'submit.php',
        data: $(this).serialize(),
        beforeSend: //do something
        complete: //do something
        success: //do something for example if the request response is success play your animation...
   });

})